Corrosion protection is an integral part of the aircraft based on almost 25 years of CL-215 salt water operation experience. All parts are completely treated for corrosion prevention before assembly.

  • Aluminum alloy is sulphuric-anodized and epoxy-primed. Polyurethane paint is applied in areas where inspections are required.
  • Steels are cadmium plated and chromated. Epoxy primer is applied and, if required, polyurethane painted.
  • All fasteners are "wet" installed with sealant. Faying (overlapping) surfaces are also wet-sealed.
  • Water-displacing, corrosion-inhibiting compound is applied.

Techniques

2024 base metal- Aluminum-copper alloy with pure aluminum cladding. Alloy exhibits superior corrosion resistance properties. Cladding provides a uniform surface for anodizing.

  1. Sulphuric acid anodizing
    Transforms surface to a fine layer of aluminum oxides which protects the surface. Also increases abrasion resistance.
  2. Dichromate seal
    Seals pores on the anodized surface. Chromate additives in the seal adds to the corrosion resistance.
  3. Epoxy primer
    Promotes adhesion of the top coat. Also contains strontium chromate which neutralizes water and prevents it from reacting with the base metal.
  4. Polyurethane topcoat
    Adds an additional barrier to protect from infiltration of corrosive contaminants. Also increases visibility for maintenance inspections.
  5. AV-30
    Is a water displacing, corrosion inhibiting compound. Renders the coating non-permeable. Especially beneficial in adjoining parts.

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