The chemical conversion coating is used in the manufacturing of aerospace products to improve paint adhesion and resistance to corrosion.
BS EN 4729 is a part of European metallic material standards that specifies trivalent chromium based chemical conversion coatings for aluminium and aluminium alloys for aerospace applications. BS EN 4729 covers the application by bath but also by touch-up.
BS EN 4729 covers coating weight and material specifications, process requirements, pre-treatment methods such as cleaning, pickling, rinsing bath, post-treatment. BS EN 4729 also describes health, safety and environmental aspects, main technical engineering requirements and quality requirements and minimum periodic tests requirements.
Note: BS EN 4729 does not give complete in-house process instructions, these shall be given in the manufacturers detailed process instructions.
BS EN 4729 on chromium-based coatings for aluminium and aluminium alloys in aerospace applications is useful for:
BS EN 4729 gives you guidelines for chromium-based chemical conversion coatings for aluminium and aluminium alloys in the aerospace field. Chemical conversion coating provides excellent anti-corrosive properties, and its use has been widespread to provide corrosion resistance for aluminium alloy and also improves paint adhesion on aircraft and military land vehicles.
BS EN 4729 meets the current manufacturing requirements to introduce trivalent chromium-based chemical conversion coatings. BS EN 4729 guides the surface treatment process of aerospace products to control the product quality and reduce costs.
By using BS EN 4729, you can manufacture the best quality coatings including all the qualities that make it best for use in aerospace applications.
EN 4729:2017