Study on substitute for zinc plating on aerospace high-strength spring
[Introduction]High-strength springs are commonly used as the components to provide driving force for deployment and locking of missile air rudders and wings.These springs are usually made of high-strength steel and treated by zinc plating to offer a surface protection,but there is a risk of brittle fracture caused by hydrogen embrittlement during the zinc plating process.[Method]The high-strength steel was treated by zinc plating,zinc-nickel plating,Dacromet coating,and aluminum ion plating,respectively.The thickness,adhesion,and corrosion resistance of the four kinds of coatings were compared to find out a suitable alternative to zinc plating.[Result]The high-strength steels treated by Dacromet coating,aluminum ion plating,or zinc-nickel alloy plating has little or no hydrogen embrittlement,but zinc-nickel alloy plating is more recommended for replacing the zinc plating.[Conclusion]The brittle fracture of high-strength spring caused by hydrogen embrittlement can be solved by selecting a surface treatment technology properly.
aerospacespringzinc platingzinc-nickel alloyDacromet coatingaluminum ion platinghydrogen embrittlementcorrosion resistance
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