オーステナイト系ステンレス鋼の腐食疲労に関する研究(第4報) : カソード電流の印加および酸化性カチオン添加の影響

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概要

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• The first factor investigated was concerned with cathodic protection in which a controlled direct current was passed through a cell whose cathode was an austenitic stainless steel specimen under cyclic loading and whose anode was a fixed carbon ring, both having been immersed in aqueous acid electrolyte. The second factor investigated was the effect of Cu^<++> ion added to aqueous acid solution as a representative of oxidizing cations. The following conclusions were obtained from this investigation:(1) Large cathodic currents whose densities ranged from 10 A/m^2 to 100 A/m^2 showed the possibility of shortening corrosion fatigue life of type 316 Ti stainless steel exposed to air-saturated 5% H_2SO_4 at 25℃ when smaller repeated stress than endurance limit in air was applied. (2) From a statistical point of view, it was anticipated that applied cathodic current of around 10 A/m^2 might perphaps not be effective, but also might not be harmful to corrosion endurance of type 316 stainless steel immersed in air-saturated 5% H_2SO_4, and cathodic current of some 2.5 A/m^2 level, however, was expected to be promising to prolong its corrosion fatigue life, when applied repeated stress did not exceed the endurance limit in air. (3) Under repeated stress beyond the endurance limit in air, austenitic stainless steels did not recieve any influence on their endurance neither from cathodic current nor from electrolytically charged hydrogen, and in all cases, hydrogen embrittlement was not observed. (4) In case of mild steel, some improvement of endurance was made by imposing cathodic current, and no sign of hydrogen embrittlement was shown when applied repeated stress was below the endurance limit in air, whilst some aggravation of endurance and hydrogen embrittlement was recognized repeated overloading was beyond the endurance limit. (5) It was found that Cu^<++>, an oxidizing cation, was probably effective as an inhibitor of corrosion fatigue of austenitic stainless steel exposed to air-saturated 5% H_2SO_4 at 25℃ and 50℃. The same effect, generally speaking might be expected from Fe^<3+>, Cr^<6+> ion etc., but further detailed investigation would be needed for their practical application.

• 社団法人日本材料学会の論文
• 1962-10-15

著者

• 木島 茂

  住友化学工業(株)新居浜製造所

• 木島 茂

  住友化学工業株式会社

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• 水の性質と腐食
• オーステナイト系ステンレス鋼の腐食疲労に関する研究(第5報) : 表面圧延と焼ばめの影響
• オーステナイト系ステンレス鋼の腐食疲労に関する研究(第4報) : カソード電流の印加および酸化性カチオン添加の影響
• オーステナイト系ステンレス鋼の腐食疲労に関する研究(第3報) : 予備繰返応力と予備腐食の影響
• オーステナイト系ステンレス鋼の腐食疲労に関する研究(第2報) : 液温および繰返速度の影響
• オーステナイト系ステンレス鋼の腐食疲労に関する研究(第1報) : 希酸溶液中における316型ステンレス鋼の腐食疲労挙動

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