SIST EN 15773:2009
(Main)Industrial application of powder organic coatings to hot dip galvanized or sherardized steel articles [duplex systems] - Specifications, recommendations and guidelines
Industrial application of powder organic coatings to hot dip galvanized or sherardized steel articles [duplex systems] - Specifications, recommendations and guidelines
This European Standard specifies the agreements to be made between the client, the galvanizer / sherardizer, the chemical suppliers and the applicators of the pre-treatment and the powder organic coating systems (if they are not one and the same). It also specifies the quality of the galvanized or sherardized articles to which the powder organic coatings are to be applied and for the pre-treatment and powder organic coatings intended for application to the galvanized or sherardized articles.
This standard applies to the application of hot dip galvanized, sherardized and powder organic coatings by controlled industrial processes to articles consisting of or manufactured from steel. The standard applies to hot dip galvanized products, galvanized in accordance with EN ISO 1461 and EN 10240 or products sherardized in accordance with EN 13811, as well as parts of these products manufactured from continuously galvanized sheet and strip galvanized in accordance with EN 10326 or EN 10327, which, after the galvanizing and/or assembly, or sherardizing, will have a powder organic coating system applied. This standard also applies to products which have been hot dip galvanized or sherardized according to specific product standards to which powder organic systems are applied.
This standard might also be useful when supplying other organic coating systems (excluding wet paint systems).
Industrielle Pulverbeschichtung von feuerverzinkten und sherardisierten Stahlgegenständen [Duplex-Systeme] - Spezifikationen, Empfehlungen und Leitlinien
Diese Europäische Norm legtenthält Angaben über Spezifikationen, Empfehlungen und Richtlinien für Verein¬barungen, die zwischen dem Kunden und dem Verzinker/Sherardisierer, den Chemikalienlieferanten sowie den Ausführenden für die Vorbehandlung und die Pulverbeschichtungssysteme (falls diese nicht identisch sind) zu treffen sind fest. Sie legt auch die Qualität an die verzinkten oder sherardisierten Gegenstände, auf die Pulverbeschichtungssysteme aufzutragen sind, sowie für die Vorbehandlung und die Pulverbeschich¬tungssysteme, die für verzinkte oder sherardisierte Artikel vorgesehen fest.
Diese Norm gilt für das Herstellen von feuerverzinkten und sherardisierten Überzügen sowie von Pulver-beschichtungen durch gesteuerte industrielle Prozesse auf GegenständeGegenständen, die aus Stahl bestehen oder aus Stahl hergestellt sind. Die Norm gilt sowohl für feuerverzinkte Erzeugnisse, verzinkt nach EN ISO 1461 und EN 10240, oder für Erzeugnisse, sherardisiert nach EN 13811, als auch für Teile aus diesen Erzeugnissen, hergestellt aus Blechen und Bändern, die nach EN 10326 oder EN 10327 kontinuierlich feuerverzinkt oder bandverzinkt sind, auf die, nach dem Verzinken und/oder dem Zusammenbau, oder nach dem Sherardisieren, ein Pulverbeschichtungssystem aufgetragen wird.
Die Norm enthält auch zusätzliche Empfehlungen und Richtlinien für Qualitätsanforderungen an die verzinkten oder sherardisierten Gegenstände, auf die Pulverbeschichtungssysteme aufzutragen sind, sowie für die Vorbehandlung und die Pulverbeschichtungssysteme, vorgesehen für verzinkte oder sherardisierte Gegenstände. Diese Norm kann auch nützlich sein für die Lieferung anderer organischer Beschichtungssysteme (ausge¬nommen flüssige Beschichtungssysteme).
Application industrielle de revêtements en poudre organiques à des produits en acier galvanisés à chaud et shérardisés [systèmes duplex] - Spécifications, recommandations et lignes directrices
La présente Norme européenne spécifie les accords à passer entre le client, le galvanisateur/shérardiseur, les
fournisseurs de composés chimiques et les applicateurs du prétraitement et des systèmes de revêtement de
poudre organiques (s'ils ne sont pas une seule et même personne). Elle spécifie également la qualité des
produits galvanisés ou shérardisés sur lesquels des revêtements de poudre organiques doivent être appliqués
et concernent aussi le prétraitement et les revêtements de poudre organiques destinés à l’application sur des
produits galvanisés ou shérardisés.
La présente Norme concerne l’application de revêtements galvanisés à chaud, shérardisés et organiques en
poudre grâce à des procédés industriels contrôlés sur des produits composés de ou fabriqués à partir d'acier.
Cette norme s'applique à des produits galvanisés à chaud, conformément à l'EN ISO 1461 et à l'EN 10240 ou
à des produits shérardisés conformément à l'EN 13811, ainsi qu'aux parties de ces produits fabriquées à
partir de tôles ou de fils galvanisés conformément à l’EN 10326 ou à l’EN 10327, sur lesquels sera appliqué,
après galvanisation et/ou assemblage ou shérardisation, un système de revêtement de poudre organique.
Elle s’applique également à des produits ayant été galvanisés à chaud ou shérardisés selon des normes de
produit spécifiques auxquelles les systèmes organiques en poudre s'appliquent.
La présente norme peut également être utile lors de la fourniture d’autres systèmes de revêtement organique
(à l’exception des systèmes de peinture liquide).
Industrijska uporaba praškastih organskih premazov za izdelke iz vroče galvaniziranega ali difuzijsko pocinkanega jekla [sistemi dupleks] - Specifikacije, priporočila in smernice
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.YURþHIndustrielle Pulverbeschichtung von feuerverzinkten und sherardisierten Stahlgegenständen [Duplex-Systeme] - Spezifikationen, Empfehlungen und LeitlinienApplication industrielle de revêtements en poudre organiques à des produits en acier galvanisés à chaud et shérardisés [systèmes duplex] - Spécifications, recommandations et lignes directricesIndustrial application of powder organic coatings to hot dip galvanized or sherardized steel articles [duplex systems] - Specifications, recommendations and guidelines25.220.60Organske prevlekeOrganic coatingsICS:Ta slovenski standard je istoveten z:EN 15773:2009SIST EN 15773:2009en,fr,de01-oktober-2009SIST EN 15773:2009SLOVENSKI
STANDARD
SIST EN 15773:2009
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15773June 2009ICS 25.220.99 English VersionIndustrial application of powder organic coatings to hot dipgalvanized or sherardized steel articles [duplex systems] -Specifications, recommendations and guidelinesApplication industrielle de revêtements en poudreorganiques à des produits en acier galvanisés à chaud etshérardisés [systèmes duplex] - Spécifications,recommandations et lignes directricesIndustrielle Pulverbeschichtung von feuerverzinkten undsherardisierten Gegenständen aus Stahl [Duplex-Systeme]- Spezifikationen, Empfehlungen und LeitlinienThis European Standard was approved by CEN on 20 May 2009.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre:
Avenue Marnix 17,
B-1000 Brussels© 2009 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15773:2009: ESIST EN 15773:2009
EN 15773:2009 (E) 2 Contents Page Foreword .4Introduction .51 Scope .62 Normative references .63 Terms and definitions .74 Ordering .84.1 General .84.2 Request for quotation . 104.3 Information provision . 104.4 Delivery of product prepared for coating . 115 Fabrication . 115.1 Surface condition of the steel . 115.2 Nature and composition of the raw material . 115.3 Welds, markings, labels . 115.4 Deviations of edges and sides . 116 Zinc coating and zinc surface . 126.1 Cooling . 126.2 Quality and inspection of the zinc coating . 126.3 Storage, packaging and transport after galvanizing or sherardizing . 136.4 Acceptance check. 137 Pre-treatment of the zinc surface . 137.1 General . 137.2 Chemical pre-treatment . 137.3 Mechanical pre-treatment (sweep blasting) . 138 Powder organic coating layers . 158.1 General . 158.2 Specification of powder organic coating . 158.3 Repair of the coating system . 159 Packaging, storage and further movement of finished products . 1510 Installation . 1511 Inspection of finished products . 1612 Health and Safety . 16Annex A (normative)
Considerations when designing and fabricating items for galvanizing or sherardizing and subsequent application of powder organic coatings . 17Annex B (informative)
Guidance on the influence of steel surface chemistry on the surface condition and pre-treatment of galvanized or sherardized articles prior to application of powder organic coatings . 18Annex C (informative)
Guidance on treatment of hot dip galvanized or sherardized articles prior to pre-treatment for application of powder organic coatings . 20C.1 Cooling . 20C.2 Prominent welds and sharp points on the zinc coating . 20C.3 Avoidance of condensation during storage, packaging and transport after galvanizing or sherardizing . 20SIST EN 15773:2009
EN 15773:2009 (E) 3 Annex D (informative)
Guidance on pre-treatment of hot dip galvanized or sherardized articles prior to the application of powder organic coatings . 21D.1 General . 21D.2 Mechanical pre-treatment . 21Bibliography . 22 Figures Figure 1 — Sweep blasting setup. 14 Tables Table 1 — Standards for powder organic coatings and hot dip galvanized steel or sherardized steel . 5Table 2 — Duplex systems: supply phases, essential communication links between parties involved and appropriate specifications / further guidance reference sources . 9Table 2
(continued) . 10Table B.1 — Coating characteristics related to steel composition . 19 SIST EN 15773:2009
EN 15773:2009 (E) 4 Foreword This document (EN 15773:2009) has been prepared by Technical Committee CEN/TC 139 “Paints and varnishes”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by December 2009, and conflicting national standards shall be withdrawn at the latest by December 2009. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 15773:2009
EN 15773:2009 (E) 5 Introduction In order to achieve a duplex system which satisfies the many varied aesthetic and performance requirements currently in existence in the marketplace, the following aspects of the supply and application of the systems should be controllable: fabrication and composition of the material (Clause 5); the zinc coating (Clause 6); surface smoothing for coating (Clause 6); environmental conditions during storage, transport and application (Clause 6); the pre-treatment of the zinc surface (Clause 7); instructions provided by chemical pre-treatment suppliers (Clause 7), powder manufacturers (Clause 8); the organic coating system (Clause 8); packaging, storage and movement of finished products (Clause 9); installation (Clause 10); inspection (Clause 11). This European Standard does not incorporate the application of paint coatings according to EN ISO 12944 (parts 1 to 8) [1] when paint systems are specified. This European Standard incorporates the application of coating powders according to EN 13438 when powder coatings are specified. Table 1 shows the relationship between this European Standard, EN 13438 and other standards relating to zinc coated articles. Table 1 — Standards for powder organic coatings and hot dip galvanized steel or sherardized steel Galvanizing or sherardizing Powder organic coatings for galvanized or sherardized steel products Communications and quality issues surrounding supply of duplex coated articles EN ISO 1461 EN 10240 EN 10326 EN 10327 EN 13811 EN 13438 or specific product specification EN 15773
Good communications in place and agreements made between galvanizer or sherardizer and client regarding general quality requirements in relation to zinc coating. NOTE prEN ISO 14713-2 and -3 also provide useful information on design for galvanizing and sherardizing respectively.
Good communications in place and agreements made between the client and the company applying the powder organic coating regarding general quality requirements of the powder organic coating. Good communications in place and agreements made between client, galvanizer or sherardizer and applicator of the powder organic coating regarding quality requirements for duplex systems in relation to quality of zinc coating, the pre-treatment and powder organic coating. SIST EN 15773:2009
EN 15773:2009 (E) 6 1 Scope This European Standard specifies the agreements to be made between the client, the galvanizer / sherardizer, the chemical suppliers and the applicators of the pre-treatment and the powder organic coating systems (if they are not one and the same). It also specifies the quality of the galvanized or sherardized articles to which the powder organic coatings are to be applied and for the pre-treatment and powder organic coatings intended for application to the galvanized or sherardized articles. This standard applies to the application of hot dip galvanized, sherardized and powder organic coatings by controlled industrial processes to articles consisting of or manufactured from steel. The standard applies to hot dip galvanized products, galvanized in accordance with EN ISO 1461 and EN 10240 or products sherardized in accordance with EN 13811, as well as parts of these products manufactured from continuously galvanized sheet and strip galvanized in accordance with EN 10326 or EN 10327, which, after the galvanizing and/or assembly, or sherardizing, will have a powder organic coating system applied. This standard also applies to products which have been hot dip galvanized or sherardized according to specific product standards to which powder organic systems are applied. This standard might also be useful when supplying other organic coating systems (excluding wet paint systems). 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 10021, General technical delivery conditions for steel products EN 10130, Cold rolled low carbon steel flat products for cold forming - Technical delivery conditions EN 10326, Continuously hot-dip coated strip and sheet of structural steels — Technical delivery conditions EN 10327, Continuously hot-dip coated strip and sheet of low carbon steels for cold forming — Technical delivery conditions EN 10163-1, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections — Part 1: General requirements EN 10163-2, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections — Part 2: Plate and wide flats EN 10163-3, Delivery requirements for surface condition of hot-rolled steel plates, wide flats and sections — Part 3: Sections EN 10221, Surface quality classes for hot-rolled bars and rods — Technical delivery conditions EN 10240, Internal and/or external protective coatings for steel tubes — Specification for hot dip galvanized coatings applied in automatic plants EN 13438, Paints and varnishes — Powder organic coatings for galvanized or sherardized steel products for construction purposes EN 13811, Sherardizing — Zinc diffusion coatings on ferrous products — Specification EN ISO 1461, Hot dip galvanized coatings on fabricated iron and steel articles — Specifications and test methods (ISO 1461:1999) SIST EN 15773:2009
EN 15773:2009 (E) 7 EN ISO 5817, Welding — Fusion-welded joints in steel, nickel, titanium and their alloys (beam welding excluded) — Quality levels for imperfections (ISO 5817:2003, corrected version:2005, including Technical Corrigendum 1:2006) prEN ISO 14713-1, Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Zinc coatings — Part 1: General principles of design and corrosion resistance (ISO/DIS 14713-1:2008) prEN ISO 14713-2, Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Zinc coatings — Part 2: Hot dip galvanizing (ISO/DIS 14713-2:2008) prEN ISO 14713-3, Guidelines and recommendations for the protection against corrosion of iron and steel in structures — Zinc coatings — Part 3: Sherardizing (ISO/DIS 14713-3:2008) ISO 9223, Corrosion of metals and alloys — Corrosivity of atmospheres — Classification 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 applicator company that applies the powder organic coating
3.2 controlled industrial process controllable and reproducible process, executed in steps under controlled conditions
NOTE Often subject to a degree of automation, carried out in industrial buildings or mobile installations. 3.3 surface smoothing of the product reduction, usually by means of mechanical finishing, of roughness associated with the galvanized or sherardized surface such that when the galvanized or sherardized surface is pre-treated and coated with the powder organic coating system, no protrusions penetrate through the organic coating
3.4 duplex system organic thermosetting or thermoplastic powder and hot dip galvanized or sherardized zinc coatings on steel products 3.5 designer
company / individual responsible for the design of a structure or product that will be finished with a duplex system 3.6 client company / individual that orders the duplex system 3.7 specifier company / individual that specifies the duplex system 3.8 sherardizer company that applies the zinc coating by the sherardizing process SIST EN 15773:2009
EN 15773:2009 (E) 8 3.9 galvanizer company that applies the zinc coating by the hot dip galvanizing process 3.10 hand dry products products free of rain and condensation water in pores and on the surface 3.11 fabricator company / individual manufacturing steel products that will be finished with a duplex system 3.12 powder manufacturer company / individual producing the organic coating powder to be applied onto the galvanized or sherardized steel substrates to complete the duplex systems 3.13 transporter company(ies) or individual(s) responsible for transportation of the hot dip galvanized or sherardized steelwork to the powder coating applicator and / or the transportation of the finished (duplex coated) work to site
3.14 installation fitting of duplex coated articles on site 3.15 pre-treatment chemical supplier company(ies) or individual(s) producing the pre-treatment chemicals to be used within the powder coating process 4 Ordering 4.1 General The client shall make sure that all of the parties involved are notified that a duplex system will be applied. This requires good communication between the client, the steel purchaser, the fabricator, the galvanizer or sherardizer, and the companies applying the pre-treatment and the powder coating.
Table 2 outlines the phases of the supply process, the requirements for communications between the parties involved at different supply stages and the requirements which apply to the various phases of the supply process. SIST EN 15773:2009
EN 15773:2009 (E) 9 Table 2 — Duplex systems: supply phases, essential communication links between parties involved and appropriate specifications / further guidance reference sources
Supply phase Essential communication links between parties involved
Requirements / guidance Design Designer Client Clause 5 - prEN ISO 14713-2 - prEN ISO 14713-3 - EN ISO 1461 - EN 13811 Order Client Fabricator Builder Construction company Galvanizer / sherardizer Powder manufacturer Pre-treatment chemical supplier Applicator Clause 4 - EN 10021 - EN 10130 - EN ISO 1461 - EN 10326
- EN 10327 - EN 13811 - EN 13438 Fabrication Client Fabricator Construction company Clause 5 - EN 10021 - EN 10163-1, -2 and -3 - EN 10221 - EN ISO 1461 - EN ISO 5817 - prEN ISO 14713-2 - prEN ISO 14713-3 Hot dip galvanizing / sherardizing Client Galvanizer / sherardizer Clause 6 - EN ISO 1461 - EN 10240 - EN 13811 - prEN ISO 14713-2 - prEN ISO 14713-3 Transport and storage of galvanized or sherardized articles Client Galvanizer / sherardizer Transporter / applicator Clause 6.3 Pre-treatment Galvanizer / sherardizer Chemical supplier and applicator Clause 7 - EN 13438 Organic coating Client Galvanizer / sherardizer Applicator(s) Clause 6.3 and Clause 8 - EN 13438 - EN ISO 1461 - EN 10240 - EN 13811 Inspection Client Applicator and Galvanizer / sherardizer Clause 11 - EN 13438 - EN ISO 1461 - EN 13811 - ISO 9223 SIST EN 15773:2009
EN 15773:2009 (E) 10 Table 2
(continued) Supply phase Essential communication links between parties involved
Requirements / guidance Transport and storage of duplex coated articles in transit and on site Client Applicator Transporter Clauses 9 and 10 and - EN 13438 Installation Client Construction company Clause 8.3 and Clauses 9 and 10
4.2 Request for quotation In its request for quotation to the galvanizer or the sherardizer, the client shall state to all relevant parties (see Table 1) that the hot dip galvanized or sherardized products shall be subsequently provided with a powder coating. In the event that the client has not submitted a request for quotation, the client shall state, upon delivery of the products to be hot dip galvanized or sherardized that a powder organic coating system is subsequently to be applied to these products. Requests for quotation shall also include the following: a) the class or classes of coating powders applied to the galvanized or sherardized steelwork – i.e. Class 1 or Class 2 of EN 13438; b) the size and weight of individual items being sent for processing (including dimensions and steel thickness); c) the coating powder colour and the gloss level required; NOTE This information is important to ensure consistency of appearance of the duplex coated articles with other work that might have been similarly specified for supply to site. d) the location of the site where the work is to be installed; e) the product standard required by the client for the duplex system. 4.3 Information provision The information provided by the client to the galvanizer shall be in accordance with EN ISO 1461 and Annex A.
The information provided by the client to the sherardizer shall be in accordance with EN 13811 and Annex A. The client shall inform the applicator of the relevant specifications (and / or parts thereof) to be applied with regard to corrosion testing on the finished articles. The client shall inform the applicator of the corrosion category the products to be treated will be exposed to, in accordance with ISO 9223 or prEN ISO 14713-1. The client shall inform the purchaser of the steel that the steel will have a duplex coating applied and that the duplex system will include hot dip galvanizing. NOTE See 5.1, Annex B and prEN 14713-2 for guidance on the influence of steel chemistry on surface characteristics of the galvanized article. The client shall inform the applicator whether in the specification protective coatings are prescribed. The client shall make such specifications available for the applicator before or at the time of the request for quotation. SIST EN 15773:2009
EN 15773:2009 (E) 11 The client shall inform all parties about the intended use of the product. 4.4 Delivery of product prepared for coating The responsibilities for provision of work with the required surface condition (immediately prior to pre-treatment for application of a powder organic coating) shall be agreed between the client and the galvanizer / sherardizer and applicator. NOTE Correct selection of the steel is important to enable provision of the required surface condition of the galvanized work (see Clause 5, Annex A and Annex B).
5 Fabrication 5.1 Surface condition of the steel The surface condition of the steel article sent for galvanizing or sherardizing (and then for application of powder coating) has a significant effect on the surface quality of the finished product. In order to achieve optimum results from the application of duplex systems, a number of characteristics of the steel substrates require attention at the earliest stages of the fabrication process (see 5.2 to 5.4 for requirements and Annex A).
NOTE For guidance on design and fabrication for galvanizing, see prEN ISO 14713-2. For Guidance on design and fabrication for sherardizing, see prEN ISO 14713-3. 5.2 Nature and composition of the raw material The steel shall be free of any laps and irregularities such as rolling blisters and rolling faults, in accordance with the standard terms and conditions of delivery in relation to the surface quality of steel (e.g. EN 10021, EN 10163-1, EN 10163-2, EN 10163-3 and EN 10221). 5.3 Welds, markings, labels The fabricator should ensure that all welds are sufficiently robust to withstand the stresses associated with the hot dip galvanizing and powder coating operations. Welds shall be free of welding spatter, welding slag and welding oxides. Welding spatter, welding slag and welding oxides shall be removed by appropriate methods such as blasting, grinding, sanding, de-scaling and/or brushing. NOTE 1 Welds might appear raised after galvanizing unless weld filler metal is used that matches the parent steel. Unless otherwise agreed, welds used in the fabrication of the article shall be smooth and continuous and shall conform to Level D in accordance with EN ISO 5817. Any welding spray applied shall be free of silicones and be water soluble.
NOTE 2 Residual welding spray should be removable using the standard pre-treatment used at the galvanizing plant. The construction parts to be delivered to the galvanizing / sherardizing plant shall be suitable for that process and in particular be free of markings applied in paint, varnish, stickers and/or inks. NOTE 3 For further information regarding galvanizing, see EN ISO 1461 and prEN ISO 14713-2 and for further information regarding sherardizing, see EN 13811 and prEN ISO 14713-3. 5.4 Deviations of edges and sides In order to prevent mechanical damage to the zinc coating and the possible development of insufficient coating of the edges and sides with powder organic coating systems, all trimming, cutting, punching, drilling SIST EN 15773:2009
EN 15773:2009 (E) 12 and other operations likely to damage the article shall be carried out prior to galvanizing unless repairs are carried out in accordance with guidance set out by the powder manufacturer (see also 6.2). Burrs at holes or along edges shall be removed prior to galvanizing.
NOTE 1 Any trimming, punching, sawing, cutting (including laser cutting, plasma cutting or similar methods which produce very sharp edges) and welding edges shall be chamfered to at least 1 mm or, preferably, rounded to a minimum of 2 mm.
NOTE 2 Perforated sheet and stretched steel does not as a rule fulfil this requirement. The capability to protect the duplex system will therefore be reduced. 6 Zinc coating and zinc surface 6.1 Cooling Unless otherwise agreed the hot dip galvanized products, after hot dip galvanizing, shall be air-cooled. See Annex C. NOTE Air-cooling is part of the sherardized process. 6.2 Quality and inspection of the zinc coating The requirements for the quality and inspection of the zinc coating depend on the type of zinc coating process used, for example: a) zinc coatings of hot dip galvanized products in accordance with EN ISO 1461; b) zinc coatings for steel tubes, applied in automatic installations in accordance with EN 10240; c) zinc coatings on steel sheet or steel strip products in accordance with EN 10326 or EN 10327; d) sherardized coatings in accordance with EN 13811. Other specific product standards not listed above might include their own requirements in this respect. Where hot-dip galvanized or sherardized products have been prepared for application of powder organic coatings, the zinc surface shall, in all cases, be free from sharp points or build up of zinc that would contravene the associated supply standard. Small, sharp projections caused by steel splinters that have been rolled in (see 5.1) and other protrusions (see 3.3) shall be smoothed off from surfaces in view, for example with an abrasive cloth. The removal of zinc when preparing for organic coating shall be minimized. A slight (sloping) thickening of the zinc coating shall be accepted provided this does not interfere with and is not damaging to the use of the product as indicated in advance by the client. Surface roughness (inherent to the galvanizing process) s
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