far PART 43 appendix D
Pitot tubes, static ports, hinges, sealed areas and bearings, wheels
Soap detergents and water
Solvents and emulsions
Mild soap and water
Soap and water
1. Environmental conditions 2. Electrolytes 3. Potential differnce
1. Surface 2. Intergranualr 3. Filliform 4. Galvanic 5. Oxidation 6. Pitting 7. Fretting
Incomplete curing of a wash primer, prior to painting
Blistered paint surfaces/ bubbles under the paint
Corrosive environment and sustained tensile stress
Steel pin and aluminium hinge material are dissimilar metals
Dark, smoky appearance and often appears around the backs of rivets
Keep clean and properly lubricated
1. Cleaning 2. Lubrication 3.Sealing 4. Inspection 5. Installing protective coats/ coverings
Nylon scrubber pads (Scotch Brite), aluminium wool or wire brush
Steel particles become embedded in aluminium and cause corrosion
Chemical that creates protective coating on aluminium alloys, and increases painting ability
It removes anodized finish
They cause the least amount of deterioration
Under a dense coating of topcoat enamel such as polyurethane. Filliform corrosion is caused by improperly cured primer.
In a location where there is a light amount of relative movement between two components and no way for the corrosive residue to be removed as it forms.
Along the grain boundaries of aluminum alloys that have been improperly heat-treated. Extruded aluminum alloy is susceptible to intergranular corrosion.
Anywhere different types of metal come in contact with each other, especially where moisture is present.
In any metal component that is continually under a tensile stress. The metal around holes in castings that are fitted with pressed-in bushings is susceptible to stress corrosion.
Remove the corrosion residue with a bristle brush or a nylon scrubber. Neutralize the surface with chromic acid or with some typer of conversion coating. Protect the surface from further corrosion with a coat of paint.
An oxide coating or aluminum cladding.
By glass bead blasting, by careful polishing with mild abrasive paper, or by using fine buffing compound on a cloth buffing wheel.
Aluminum wool or aluminum wire brushed. Severe corrosion can be removed with a rotary file.
Methyl Ethyl Ketone (MEK) or lacquer thinner