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Stress corrosion cracking of high strength aerospace bolts is mostly limited to alloy steels, whose susceptibility to pitting corrosion is generally a secondary requirement compared to the outstanding tensile and fatigue properties needed. In order to provide environmental resistance for the bolt, a coating or plating is usually applied, which protects the underlying metal. In many cases, the coating chosen has proven to be inadequate. Therefore, a program was initiated to perfect a test method and gather reliable results from which predictable performance data could be obtained.
Many coatings were ultimately evaluated by a simple laboratory test method in which the coated bolt was statically stressed and exposed to a corrosive medium until failure occurred. The test is capable of evaluating a wide variety of coatings in periods from a few hundred to several thousand hours.
stress corrosion cracking, coatings, high strength steels, bolts, environmental tests, corrosion, plating, pitting
Corrosion engineer, Standard Pressed Steel Co., Jenkintown, Pa.