科研之友
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摘要
Investigation results under structure and physicochemical properties of glow-discharge nitrided (H(2)/N(2) atmosphere, 520 degrees C) AISI 4140 (42CrMo4) steel are presented in the paper. The successive thinning method has been applied to determine corrosion resistance changes within the cross-section of the nitrided layer. The method consists in step by step polarization corrosion measurements for successive surfacial layers. The potentiokinetic polarization tests were carried out in acidified (pH = 2) 0.5 M sulphate solution. Depth and structure of the nitrided layers were evaluated on the basis of microscopic observations as well as microhardness and chemical analysis within nitrided layer. The performed nitriding treatment was prone to clear improvement of corrosion characteristics of the outer layers of the tested steel (up to ca 20 mu m) within the passive range. Nitriding did not affect the corrosion behaviour of the tested steel in active range.
- 出版日期2010
