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Stress Corrosion Corrosion Fatigue Fretting Corrosion Heat Treatment |
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Corrosion Prone Areas |
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Discussed briefly in this section are most the trouble areas common to all aircraft. However, this coverage is not necessarily complete and may be amplified and expanded to cover the special characteristics of the particular aircraft model involved by referring the applicable maintenance manual. Exhaust trail area. Both jet and reciprocating engine exhaust deposits are very corrosive and give particular trouble where gaps, seams, hinges, and fairings are located down the exhaust path and where deposits may be trapped and not reached by normal cleaning methods. Special attention should be paid to areas around rivet heads and in skin crevices. Fairings and access plates in the exhaust areas should be removed for inspection. Exhaust deposit buildup in remote areas such as the empennage surfaces should not be overlocked. Buildup in these areas will be slower and sometimes completely absent, but it has become a problem on some currently operating aircraft. Battery compartements and battery vent openings. Deposite improvements in protective paint finishes and in methods of sealing and venting, battery compartements continue to be corrosion problem areas. Fumes from overheated electrolyte are difficult to contain and will spread to adjacent cavities and cause a rapid, corrosive attack on all unprotected metal surfaces. Battery vent openings on the aircraft skin should be included in the battery compartement inspection and maintenance procedure. Regular cleaning and neutralization of acid deposits will minimize corrosion from this cause. Bilge areas. These are natural sumps for waste hydraulic fluids, water, dirt, and odds and ends of debris. Residual oil quite often masks small quantities of water which settle to the bottom and set up a hidden chemical cell. Seaplane and amphibian aircraft bilge areas are protected by small bags of potassium dichromate inhibitot supanded near the loe point in each bilge compartement. These crystals dissolve in any waste water and tend to inhibit the attack on exposed metal surfaces. Inspection procedures should include replacement of these bags when most of the chemical has been dissolved. Particular attention must be paid to areas located under galleys and lavatories and human waste disposal openings on the aircraft exteriors. Human waste products and the chemicals used in lavatories are very corrosive to the common aircraft metals. Clean these areas frequently and keep the paint touched up. |
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| Corrosion of ferrous metals. | ||
| One of the most familiar types of corrosion is ferrous oxide,.. | ||
| Corrosion of aluminum and aluminum alloys. | ||
| Corrosion attack on aluminum surfaces is usually quite obvious, | ||
| Corrosion of magnesium alloy | ||
| Magnesium is the most chemically active of the metals used,. | ||
| Treatment of titanium and titanium alloys. | ||
| Attack on titanium surfaces is generally difficult to detect | ||
| Protection of dissimilar metal contacts. | ||
| Certain metals are subject to corrosion when placed in contact with other metals | ||
| Processes and materials used in corrosion control. | ||
| Aircraft parts are almost always given some type surface finish | ||
| Chemical treatment. | ||
| Parco Lubrizing in a chemical treatment for iron and steel parts | ||
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Inspection Corrosion Prone Areas Corrosion Limits |
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