EVALUATION OF CADMIUM PLATING SYSTEMS FOR HYDROGEN EMBRITTLEMENT
A cooperative testing program to compare the hydrogen embrittlement characteristics of several available plating systems was conducted. Eleven plating systems that showed promise of being nonembrittiing were selected for evaluation. The plating systems evaluated approached the problem of reduction of hydrogen entry and/or subsequent removal from steel by: porous deposits and subsequent baking to remove and/or distribute hydrogen absorbed; high efficiency (low hydrogen producing bath) with subsequent baking; suppression of hydrogen formation by additives; organic baths with no hydrogen formation; and organo brush plating baths. The 0.003-inch notch root radius tensile specimen and the ring specimen evaluated previously were selected to test and evaluate the plating systems. The same heat of material was used for fabricating test specimens. The test grips and the alignment procedure for the sustained load notched tensile test were shown to produce the specified minimum bending stress. The cadmium plating of ring and notched tensile specimens for evaluation of the individual plating systems was identical insofar as possible. The sustained load notched tensile test appeared to be more sensitive to the relative degree of hydrogen embrittiement than the stressed ring test. The plating systems evaluated by both test methods were grouped for comparison and results are presented. (auth)
- Research Organization:
- Boeing Co. Military Aircraft Systems Div., Wichita, Kan.
- NSA Number:
- NSA-17-020454
- OSTI ID:
- 4716936
- Report Number(s):
- D3-4657
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
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