Abstract
SYNOPSISIt has been shown that certain cadmium plating techniques can significantly reduce the air fatigue properties of steels of 80–125 tons/in2 tensile strength. Although the mechanism controlling fatigue-strength reduction has not been clearly established, the data suggest that occlusion and subsequent diffusion of hydrogen resulting from the plating operation, and in certain cases from pre-plating cleaning, exert a considerable influence on the substrate fatigue behaviour. Evidence from preliminary investigations indicated a dependence of fatigue strength reduction on the interaction of substrate surface residual stress and standard cadmium/hydrogen electrodeposition. More recent work on one particular steel has demonstrated that the fatigue properties are appreciably reduced only under the adverse combination of residual tension and an abnormally high hydrogen content in the steel fibres. Two non-electrolytic metallic surface protection procedures—cadmium peen-plating and aluminium spraying—have bee...
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