窒化鋼の單極電位差に就て

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The writer measured the single potential differences between nitrified or non-nitrified special steels containing chromium, aluminium, titanium and zirconium and distilled water, sea water, saturated copper sulphate solution and normal ferrous sulphate solution. He found that special steels, when nitrified, become nobler about 0.6 volt in distilled water and abont 0.2 volt in sea water, but become baser about 0.07 volt at first and finally about 0.03 volt in normal ferrous sulphate solution. In saturated copper sulphate solution nitrified special steel has a positive potential of 0.19 volt. In distilled water nitrified steels become black but never rusty to form red hydroxide of iron (passive state). In normal ferrous sulphate solution, nitrified steels, Containing no elements that produce great hardness, (except 0.3% carbon steel) show at the begining of their time voltage curves the positive potential of 0.1 volt and become slightly baser (without exception) about 0.04 volt instead of 0.03 volt. Considering the above facts, the special elements to be added to produce great hardness may prevent the outside brittle layer from being produced and small particles of iron may be produced in the outer layer of steels as the result of nitrification.
社団法人日本鉄鋼協会の論文
1930-01-25