SIST EN 15340:2007

Thermal spraying - Determination of shear load resistance of thermally sprayed coatings

This European Standard specifies the procedure for determination of the shear load resistance of thermally sprayed coatings, provided that a minimum thickness is given.
Additionally this European Standard defines the shear load resistance and the designation of the fracture’s structure on the test specimen, which occurs when the shear adhesive or adhesive/ cohesive or cohesive strength of the coating or the coating system will be exceeded.
The test report is the basis for comparative statements regarding shear load resistance and structure of fracture.
NOTE   The test for the determination of the shear load resistance is not recommended for sprayed coatings thinner than approximately 150 µm because the adjustment of shear distance becomes critical.

Thermisches Spritzen - Bestimmung des Scherbeanspruchungswiderstandes bei thermisch gespritzten Schichten

La présente Norme européenne prescrit le mode opératoire permettant de déterminer la résistance au cisaillement des revêtements obtenus par projection thermique, à condition de disposer d’une épaisseur minimale.
De plus, la présente Norme européenne définit la résistance au cisaillement et la désignation de la structure de la rupture qui se produit sur l’éprouvette en cas de dépassement de l’adhérence en cisaillement ou de l’adhérence en cisaillement/en cohésion ou de la cohésion en cisaillement du revêtement ou du système de revêtement.
Les observations comparatives concernant la résistance au cisaillement et la structure de la fissure se fondent sur le rapport d’essai.
NOTE   L’essai portant sur la détermination de la résistance au cisaillement est déconseillé pour tout revêtement projeté d’une épaisseur inférieure à environ 150 µm, le réglage de la distance de cisaillement devenant alors critique.

Projection thermique - Détermination de la résistance au cisaillement des revetements obtenus par projection thermique

Vroče brizganje – Ugotavljanje odpornosti vroče brizganih prevlek proti strižnim obremenitvam

General Information

• Status: Published
• Publication Date: 23-May-2007
• ICS: 25.220.20 - Surface treatment
• Technical Committee: IPKZ - Protection of metals against corrosion
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 06-Apr-2007
• Due Date: 11-Jun-2007
• Completion Date: 24-May-2007
• Ref Project: EN 15340:2007 - Thermal spraying - Determination of shear load resistance of thermally sprayed coatings

Overview

EN 15340:2007 (CEN) - "Thermal spraying - Determination of shear load resistance of thermally sprayed coatings" defines a standardized laboratory procedure to measure the shear load resistance of thermally sprayed coatings. The standard covers test setup, specimen preparation, test execution and reporting, and classification of fracture modes (adhesive, cohesive or mixed). It is intended for coatings that meet a minimum thickness (the test is not recommended for coatings thinner than ~150 µm).

Key topics and technical requirements

• Purpose: Determine adhesive strength (coating/substrate interface), cohesive strength (within the coating) or mixed failure by loading the coating parallel to the interface.
• Specimen geometry and preparation: Coated area typically 5 mm × 10 mm on a prepared substrate; coating thickness must be measured (non‑destructively or by metallography). Avoid overspray; abrasive cleaning (120 grit recommended) may be used to remove unavoidable overspray.
• Test equipment: Universal testing machine per EN ISO 7500-1 (class 2.5) or equivalent desktop machine; hard‑metal shear plate (ISO 1832 examples suggested) mounted on a guided punch; load cell and displacement gauge to record force–displacement.
• Key test parameters:
  • Shear distance d = 50 µm ± 20 µm (account for surface roughness)
  • Shear plate travel speed ≈ 50 µm/s
  • Minimum of five specimens per spray cycle for statistics
• Results and acceptance: Shear load resistance is taken as the first peak of the force–displacement curve. Report arithmetic mean and standard deviation (SD must be < 10 %; otherwise repeat testing). Shear energy (area under the curve to first maximum) may be calculated for energy absorption assessment.
• Fracture modes:
  • Mode 1 - adhesive failure at interface (FSa)
  • Mode 2 - mixed adhesive/cohesive (FSa/c)
  • Mode 3a/3b - cohesive failures within coating (FSc), with subtypes for brittle/ductile behavior
• Test report essentials: inspector, specimen material, coating thickness/material, shear distance, shear plate geometry, speed, all single measurement results with fracture types, mean and SD, and special remarks.

Applications and users

EN 15340:2007 is used for:

• Quality control and acceptance testing in thermal spray workshops
• Process development and optimization (surface prep, spray parameters, materials)
• Comparative evaluation of coating systems (bond/top coats)
• Failure analysis and R&D on coating adhesion/cohesion

Typical users: coating engineers, QA inspectors, material scientists, specification writers, and procurement professionals requiring reproducible adhesion data for thermally sprayed coatings.

Related standards

• EN 657:2005 (thermal spraying terminology/classification)
• EN ISO 7500-1 (verification of testing machines)
• ISO 1832 (indexable inserts - shear plate geometry examples)
• EN 582, EN ISO 2064 (referenced in bibliography for related coating tests)

Keywords: EN 15340:2007, thermal spraying, shear load resistance, thermally sprayed coatings, shear test, coating adhesion, cohesive strength, CEN.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Thermal spraying - Determination of shear load resistance of thermally sprayed coatingsREUHPHQLWYDPProjection thermique - Détermination de la résistance au cisaillement des revetements obtenus par projection thermiqueThermisches Spritzen - Bestimmung des Scherbeanspruchungswiderstandes bei thermisch gespritzten SchichtenTa slovenski standard je istoveten z:EN 15340:2007SIST EN 15340:2007en;fr;de25.220.20Površinska obdelavaSurface treatmentICS:SLOVENSKI
STANDARDSIST EN 15340:200701-junij-2007

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 15340March 2007ICS 25.220.20 English VersionThermal spraying - Determination of shear load resistance ofthermally sprayed coatingsProjection thermique - Détermination de la résistance aucisaillement des revêtements obtenus par projectionthermiqueThermisches Spritzen - Bestimmung desScherbeanspruchungswiderstandes bei thermischgespritzten SchichtenThis European Standard was approved by CEN on 3 February 2007.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: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 15340:2007: E

Evaluation.11 Annex B (informative)
Coating systems and sources of error.14 B.1 Coating systems (bond/top coat).14 B.2 Faults in testing.14 Bibliography.15

“Mode 3a” - if in case of hard coatings continuous blistering of small or larger pieces of the coating occurs; - if soft and/or porous coatings will be compressed and continuously scraped off; • “Mode 3b” - if the fracture path runs within the coating especially parallel to the interface coating/substrate and the coating part under the shear plate detaches in one piece 3.4 shear energy ES area below the force displacement curve provided by the shear test NOTE The energy ES up to the first shear force maximum can be calculated using the force-displacement curve provided by the shear test. The energy ES relates to the energy absorption of the coating-substrate system until failure. 3.5 shear distance d distance between interface coating/substrate and the edge of the shear plate 3.6 shear load resistance value of the first maximum of the load during the shear test process 4 Equipment The shear test may be performed using a universal testing machine in accordance with EN ISO 7500-1 class 2.5 or using stand alone desk top machine which fulfils the corresponding requirements for accuracy and reproducibility. The construction of the testing machine shall be able to apply a force required for the operation. The principle of the testing set up is demonstrated in Figure 1.

Key 1 load cell
6 specimen holder 2 guided punch
7 displacement gauge
...