Abstract
The aerospace industry uses 200-h sustained-load test (SLT), described in ASTM F-519, to evaluate hydrogen embrittlement (HE) of their 4340 steel electroplated parts. The cadmium plating used in ASTM F-519 suggest that the coating density may affect HE in an important manner. Therefore, in this work, 4340 steel notched bars were plated with five different cadmium coating densities. Then, the SLT was combined with thermal desorption spectroscopy (TDS) to evaluate: (i) the degree of HE, and (ii) the hydrogen content of the cadmium-plated 4340 steel samples. The results show strong evidences that the major factor causing HE of cadmium-plated 4340 steel is the coating density. Moreover, an advanced analysis of TDS curves using the Hertz–Knudsen equation allows distinguishing hydrogen in steel from hydrogen in the cadmium coating. The advanced analysis also gives an estimation of the coating density, and therefore indicates if the baking will be effective at relieving embrittlement. Finally, TDS could be a good complementary tool to the SLT in evaluating HE.
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