SIST EN ISO 14921:2012
(Main)Thermal spraying - Procedures for the application of thermally sprayed coatings for engineering components (ISO 14921:2010)
Thermal spraying - Procedures for the application of thermally sprayed coatings for engineering components (ISO 14921:2010)
This standard relates to the general procedures of application of thermally sprayed coatings as defined in EN 657.The purpose of these coatings being either to reclaim worn and non conforming parts or to enhance the surface properties of components for specific purposes. For example, to provide wear resistance, low coefficient of friction, electrical or thermal conductivity or insulation, and resistance to corrosion.
Thermisches Spritzen - Vorgehen für das Anwenden thermischer Spritzschichten für Bauteile im Maschinenbau (ISO 14921:2010)
Diese Internationale Norm legt die generelle Vorgehensweise fest, wenn thermisch gespritzte Schichten zur
Reparatur verschlissener und nicht passender Teile oder der Verbesserung der Oberflächeneigenschaften
von Bauteilen angewendet werden.
Diese Internationale Norm legt aufgrund der Vielfalt an technologischen, physikalischen und/oder chemischen
Anforderungen und der Bauteilgeometrie keine bestimmten Verfahren für spezielle Arbeiten fest.
Diese Internationale Norm legt allgemeine Auswahlbedingungen für das Spritzverfahren und Werkstoffe fest.
Sie gilt nicht für thermisch gespritzte Zink- und/oder Aluminiumschichten für den Schutz von
Stahlkonstruktionen gegen atmosphärische Korrosion, hierfür gilt ISO 2063.
Diese Internationale Norm gilt ebenfalls nicht für Schichten aus selbstfließenden Legierungen mit
anschließendem Umschmelzen, die durch ISO 14920 abgedeckt sind.
Projection thermique - Mode opératoire d'application de revêtements obtenus par projection thermique pour les pièces mécaniques (ISO 14921:2010)
L'ISO 14921:2010 spécifie le mode opératoire général à suivre lorsqu'un revêtement obtenu par projection thermique est appliqué pour améliorer les propriétés de la surface d'une pièce ou pour récupérer des pièces usées et non conformes.
Compte tenu de la diversité des exigences technologiques, physiques et/ou chimiques et de la forme de la pièce, il convient de ne pas utiliser l'ISO 14921:2010 pour fournir des méthodes reconnues pour une pièce à traiter spécifique.
L'ISO 14921:2010 spécifie les conditions générales pour le choix du mode opératoire de projection et des matériaux à utiliser cet effet. Elle n'est pas applicable aux revêtements de zinc et/ou d'aluminium obtenus par projection thermique destinés à protéger les structures en acier contre la corrosion atmosphérique, pour lesquels l'ISO 2063 est applicable.
L'ISO 14921:2010 ne s'applique pas non plus aux revêtements en alliages auto-fondants qui sont fondus à une étape ultérieure. Ce mode opératoire relève de l'ISO 14920.
Vroče brizganje - Postopki nanašanja vroče brizganih prevlek na strojne dele (ISO 14921:2010)
Ta mednarodni standard določa splošni postopek za nanos vroče brizgane prevleke, ki okrepi površinske lastnosti strojnega dela ali izboljša obrabljene in neskladne strojne dele. Ta mednarodni standard zaradi različnih tehnoloških, fizikalnih in/ali kemijskih zahtev in oblike strojnih delov ne podaja definitivnih metod za konkretno delo. Ta mednarodni standard določa splošne pogoje za izbiro postopka in materiale brizganja. Ne velja za vroče brizgane cinkove in/ali aluminijeve prevleke za zaščito jeklenih struktur pred atmosfersko korozijo, za kar velja ISO 2063. Ta mednarodni standard tudi ne velja za prevleke iz samotaljivih zlitin, ki se v nadaljevanju stalijo. Ta postopek je zajet v ISO 14920.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 14921:2012
01-januar-2012
1DGRPHãþD
SIST EN ISO 14921:2002
9URþHEUL]JDQMH3RVWRSNLQDQDãDQMDYURþHEUL]JDQLKSUHYOHNQDVWURMQHGHOH ,62
Thermal spraying - Procedures for the application of thermally sprayed coatings for
engineering components (ISO 14921:2010)
Thermisches Spritzen - Vorgehen für das Anwenden thermischer Spritzschichten für
Bauteile im Maschinenbau (ISO 14921:2010)
Projection thermique - Mode opératoire d'application de revêtements obtenus par
projection thermique pour les pièces mécaniques (ISO 14921:2010)
Ta slovenski standard je istoveten z: EN ISO 14921:2010
ICS:
25.220.20 Površinska obdelava Surface treatment
SIST EN ISO 14921:2012 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 14921:2012
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SIST EN ISO 14921:2012
EUROPEAN STANDARD
EN ISO 14921
NORME EUROPÉENNE
EUROPÄISCHE NORM
December 2010
ICS 25.220.20 Supersedes EN ISO 14921:2001
English Version
Thermal spraying - Procedures for the application of thermally
sprayed coatings for engineering components (ISO 14921:2010)
Projection thermique - Mode opératoire d'application de Thermisches Spritzen - Vorgehen für das Anwenden
revêtements obtenus par projection thermique pour les thermischer Spritzschichten für Bauteile im Maschinenbau
pièces mécaniques (ISO 14921:2010) (ISO 14921:2010)
This European Standard was approved by CEN on 10 December 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN-CENELEC 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 translation
under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same
status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, 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 STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2010 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 14921:2010: E
worldwide for CEN national Members.
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SIST EN ISO 14921:2012
EN ISO 14921:2010 (E)
Contents Page
Foreword .3
2
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SIST EN ISO 14921:2012
EN ISO 14921:2010 (E)
Foreword
This document (EN ISO 14921:2010) has been prepared by Technical Committee CEN/TC 240 “Thermal
spraying and thermally sprayed coatings”, the secretariat of which is held by DIN, in collaboration with
Technical Committee ISO/TC 107 “Metallic and other inorganic coatings”.
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 June 2011, and conflicting national standards shall be withdrawn at
the latest by June 2011.
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.
This document supersedes EN ISO 14921:2001.
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, Croatia, 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.
3
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SIST EN ISO 14921:2012
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SIST EN ISO 14921:2012
INTERNATIONAL ISO
STANDARD 14921
Second edition
2010-12-15
Thermal spraying — Procedures for the
application of thermally sprayed coatings
for engineering components
Projection thermique — Mode opératoire d'application de revêtements
obtenus par projection thermique pour les pièces mécaniques
Reference number
ISO 14921:2010(E)
©
ISO 2010
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SIST EN ISO 14921:2012
ISO 14921:2010(E)
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ii © ISO 2010 – All rights reserved
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SIST EN ISO 14921:2012
ISO 14921:2010(E)
Contents Page
Foreword .iv
Introduction.v
1 Scope.1
2 Normative references.1
3 Terms and definitions .1
4 Component and coating design considerations.1
4.1 General .1
4.2 Pre-inspection in the case of repair .2
4.3 Component substrate .2
4.4 Coating .2
5 Preliminary machining by turning, milling, or grinding .3
6 Masking .3
7 Methods of surface preparation.3
8 Thermal spraying.4
9 Inspection after spraying.4
10 Sealing.4
11 Finishing.4
12 Final inspection .4
13 Documentation .5
Annex A (informative) Flow chart for assessment of suitability of thermal spraying .6
Annex B (informative) Check list for evaluation of the most suitable coating system for the
intended purpose .7
Annex C (informative) Record for the applied thermal spray procedure .8
Bibliography.12
© ISO 2010 – All rights reserved iii
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SIST EN ISO 14921:2012
ISO 14921:2010(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 14921 was prepared by Technical Committee CEN/TC 240, Thermal spraying and thermally sprayed
coatings of the European Committee for Standardization (CEN) in collaboration with ISO Technical Committee
ISO/TC 107, Metallic and other inorganic coatings in accordance with the Agreement on technical cooperation
between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 14921:2001), which has been technically
revised.
iv © ISO 2010 – All rights reserved
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SIST EN ISO 14921:2012
ISO 14921:2010(E)
Introduction
Components might fail if the surface does not fulfil the physical, chemical, and/or technological requirements.
For several applications, this deficiency can be avoided by a thermally sprayed coating.
Where appropriate, a coating may be applied to protect the component's surface or to improve its behaviour
by increasing the resistance against wear and/or corrosion, or the electrical or thermal conductivity or
insulation or by reducing the friction coefficient.
There are limits to the applicable thickness of some thermally sprayed coatings. However, several different
coatings may be built up one upon another. In the case of extensive loss of material through corrosion or wear,
an alternative suitable spraying material may be applied prior to the top coat or the bond and top coat.
© ISO 2010 – All rights reserved v
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SIST EN ISO 14921:2012
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SIST EN ISO 14921:2012
INTERNATIONAL STANDARD ISO 14921:2010(E)
Thermal spraying — Procedures for the application of thermally
sprayed coatings for engineering components
1 Scope
This International Standard specifies the general procedure, when a thermally sprayed coating is applied to
enhance the surface properties of a component or to reclaim worn and non-conforming parts.
This International Standard does not provide definitive methods for specific work due to the variety of the
technological, physical and/or chemical requirements and of the component's shape.
This International Standard specifies the general conditions for the selection of the spraying procedure and
materials for this purpose. It does not apply to thermally sprayed zinc and/or aluminium coatings for
protection of steel structures against atmospheric corrosion, for which ISO 2063 applies.
This International Standard also does not apply to coatings of self-fluxing alloys which are subsequently fused.
That procedure is covered by ISO 14920.
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.
ISO 14923, Thermal spraying — Characterization and testing of thermally sprayed coatings
EN 657:2005, Thermal spraying — Terminology, classification
EN 13507, Thermal spraying — Pre-treatment of surface of metallic parts and components for thermal
spraying
EN 15520, Thermal spraying — Recommendations for constructional design of components with thermally
sprayed coatings
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 657:2005 apply.
4 Component and coating design considerations
4.1 General
If any of the considerations in 4.2 to 4.4 cannot be met satisfactorily, thermal spraying is not recommended.
Factors which should be considered are illustrated in the flow chart shown in Annex A.
© ISO 2010 – All rights reserved 1
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SIST EN ISO 14921:2012
ISO 14921:2010(E)
Judgements of the possibility for coating new parts may be carried out by assessing the drawing of the
component and the area to be sprayed.
If a coating specification defines the spraying material, the factors to be considered are reduced.
4.2 Pre-inspection in the case of repair
Before carrying out a preparation procedure on the component, it shall be inspected to assess its suitability for
spraying. Attention shall be given to the following:
⎯ The concentricity and straightness of parts which rotate when operating and the shape and geometry of
parts operated with a reciprocating or sliding motion shall be checked and, where necessary, corrected.
⎯ The surface to be coated shall be inspected to check that it is free from cracks or other damage which
can affect the performance of the coating. If any serious defects cannot be removed or repaired, spraying
cannot be carried out satisfactorily.
⎯ Establish dimensions of the area to be sprayed.
⎯ The component shall be checked for any evidence of a previous coating, which, if present, shall usually
be removed.
⎯ Check and take into account the surface hardness of the work piece.
4.3 Component substrate
To establish whether a thermally sprayed coating is suitable for the intended purpose, consideration should be
given to the following.
⎯ Certain substrate materials are not suitable for thermal spraying or require special consideration in
processing.
⎯ Thermally sprayed coatings do not increase the strength of the part generally, and therefore the effects of
any reduction in the dimensions of the original component shall be considered.
⎯ The fatigue strength can be affected by the method of surface preparation, the spray material and the
spray procedure.
⎯ Certain processes to improve the surface condition, such as nitriding, can leave gaseous inclusions which
can have a detrimental effect on the surface preparation, bonding, and porosity in the coating.
⎯ Where hardened surfaces prevent a proper preparation, the limitations of the coating system which can
be applied, and the properties subsequently derived, shall be considered.
⎯ The area to be coated shall be accessible for applying the complete coating procedure. Therefore, the
requirements for the processes of preparing, spraying and testing, spray gun with its electrical and/or gas
connections, required distance and spray angle shall be considered.
4.4 Coating
The spray process and spray material can exert a tremendous influence on the coating properties.
To determine the most suitable coating system, consideration of the following is required:
⎯ bond strength requirement;
⎯ thickness requirement;
⎯ surface requirement (roughness);
2 © ISO 2010 – All rights reserved
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SIST EN ISO 14921:2012
ISO 14921:2010(E)
⎯ surface load; thermally sprayed coatings are sensi
...
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