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Abstract
Incremental step load testing per ASTM F1940 was used to rank a number of industrial fastener coating processes for their propensity to cause internal hydrogen embrittlement. In the case of hot dip galvanizing, 4340 steel test specimens were severely embrittled, even in the absence of any exposure to hydrogen from the coating process. Evidently, the thermal shock caused during immersion in molten zinc releases otherwise innocuous trapped hydrogen. This hypothesis was confirmed with the help of a thermal desorption spectrometer, whereby residual hydrogen was extracted from test specimens prior to galvanizing, thus preventing their embrittlement.
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