DOC AIRBUS | AMM A320FCORROSION PREVENTION - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
1. General
Corrosion, the removal of corrosion and subsequent maintenance have a direct effect on the operational safety and the in-service capability of the aircraft.
** ON A/C NOT FOR ALL Corrosion, the removal of corrosion and subsequent maintenance have a direct effect on the operational safety and the in-service capability of the aircraft.
2. Description
Corrosion-resistant materials and protective layers are applied at the construction stage to get the maximum possible resistance to corrosion.
** ON A/C NOT FOR ALL Corrosion-resistant materials and protective layers are applied at the construction stage to get the maximum possible resistance to corrosion.
3. Corrosion Protection
A. Surface Treatments (Galvanic or Chemical)
(1) The surface treatment for aluminum-alloy components are yellow chromating or chromic acid anodizing.
(2) Bonded aluminum-alloy components have a surface treatment of chromic acid anodizing or pickling and bonding primer.
(3) Steel parts have a surface treatment of cadmium plating, chrome plating or phosphating.
(4) Titanium or stainless-steel components assembled to aluminum alloy components have a surface treatment of cadmium, zinc, or aluminum plating.
(5) A paint surface treatment has a polyurethane or epoxy primer to give protection against corrosion. A top layer of polyurethane is applied to give protection against the chemical damage.
B. Protection of Mating Surfaces
(1) The surface treatments are applied to the mating surfaces. Also, the sealant or anticorrosion material is applied between components assembled together. For example, install adhesive tape at all the bushes of the lavatories and galley.
Temporary Protection of the Lavatories and Galleys Attachment Fitting(2) A chemical conversion layer is applied to rivets installed in light alloy, anodized titanium and cadmium-plated steel components.
(3) Shafts are installed and coated with grease or anticorrosion materials.
(4) Paint or soft varnish is applied to give protection to joint seams of components assembled together.
(5) Sealant is applied to give protection to the bonded edges. This is applied to the areas that can have corrosion damage.
(6) Soft varnish is applied to give protection to the fillet seals. This is applied to areas that can have chemical damage.
For further information (Ref. ASRM 51-22-00).
For further information (Ref. ASRM 51-22-00).