BS EN ISO 17834:2003 – Thermal spraying — Coatings for protection against corrosion and oxidation at elevated temperatures

1 Scope
This standard is applicable to sprayed metal coatings for protection against corrosion at temperatures up to 1000°C (1273 K).
www. bzfxw. com
For the protection of iron and steel by sprayed aluminium and zinc coatings against atmospheric corrosion reference should be made to prEN ISO 2063.
Coating materials other than metals, although they may be applied by spraying, are outside the scope of this standard.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies (including amendments).
EN 1274, Thermal spraying — Powders — Composition — Technical supply conditions.
EN 13507, Thermal spraying — Pre-treatment of surfaces of metallic parts and components for thermal spraying.
prEN ISO 2063, Thermal spraying — Metallic and other inorganic coatings — Zinc, aluminium and their alloys (ISO/DIS 2063:2002).
EN ISO 14919, Thermal spraying — Wires, rods and cords for flame and arc spraying — Classification — Technical supply conditions (ISO 14919:2001).
ISO 14232, Thermal spraying — Powders — Composition and technical supply conditions.
3 Coating material and processes
When selecting coating materials and processes, consideration shall be given to the different working temperatures and operating environments that may be found.
For example in any temperature range a coating may be required to resist:
oxidation;
other chemical attacks or;
a combination of oxidation and other chemical attacks.
Typical coating materials will include the following:
nickel/chromium alloys;
iron/chromium/aluminium alloys;
metal/chromium/aluminium/yttrium alloys.
NOTE The metal can be nickel, cobalt, iron or alloys of these.
Other inert wear resistant materials such as chromium carbide, may be blended with these alloys to provide a combination of properties.
www. bzfxw. com
When selecting coating materials, the following reactants and their effects either individually or when combined shall be considered:
oxygen;
sulphur;
chlorine;
vanadium;
potassium;
sodium.
Taking each of these in turn, the following points shall be considered:
a) depending upon the presence or absence of oxygen, the corrosion characteristic can change significantly.
Purely oxidising conditions indicate the use of aluminium alone;
BS EN ISO 17834:2003 – Thermal spraying — Coatings for protection against corrosion and oxidation at elevated temperatures