SYMPOSIA PAPER Published: 01 January 1972

Stress Corrosion Crack Protection from Coatings on High Strength H-11 Steel Aerospace Bolts


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.

Author Information

Taylor, E
Standard Pressed Steel Co., Jenkintown, Pa.
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Developed by Committee: G01
Pages: 131–138
DOI: 10.1520/STP34699S
ISBN-EB: 978-0-8031-4619-8
ISBN-13: 978-0-8031-0096-1