Hydrogen Embrittlement of Cadmium-Plated Ultra-High Strength Steels in Paint Strippers
AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)
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Slow strain rate and electrochemical tests were applied to elucidate the mechanism of hydrogen embrittlement of high strength 4340 steel by paint strippers. Results show that hydrogen embrittlement does not occur unless the steel is cadmium plated and is due to hydrogen generation produced by the establishment of a galvanic couple between the steel and the cadmium in the paint stripper. The amount of embrittlement is seen to increase as the galvanic potential becomes increasingly more negative compared with the potential for the reduction of water to produce hydrogen. The role of inhibitors in the prevention of hydrogen embrittlement is discussed. Additional keywords Paint remover Galvanic corrosion Cadmium coatings Aircraft Australia.
- Properties of Metals and Alloys