食塩水中のステンレス鋼の隙間腐食と応力腐食割れに及ぼすCl<sup>-</sup>濃度と温度の影響

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  • The Influence of Chloride Content and Temperature on Crevice Corrosion and Stress Corrosion Cracking of Stainless Steels in Sodium Chloride Solution
  • 食塩水中のステンレス鋼の隙間腐食と応力腐食割れに及ぼすCl-濃度と温度の影響
  • ショクエンスイチュウ ノ ステンレス コウ ノ ゲキカン フショク ト オウリ

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The influence of temperature and chloride content on the behavior of localized corrosion such as crevice corrosion and on the occurrence of stress corrosion cracking have been investigated by long term immersion of the spot-welded specimens of ferritic and austenitic stainless steels in 100-21, 000ppm Cl- solutions at 40°-80°C. The extent of the corrosion activity of the steel during the test period was followed by galvanic couple current between the test specimen and the crevice-free specimen prepared from the same kind of the steel. In the low carbon Type 430 ferritic stainless steel intergranular corrosion as well as pitting corrosion took place in all test runs and these corrosion actions continued through-out the test period. Titanium stabilized ultra-low carbon ferritic stainless steels, 17Cr-Ti, 17Cr-1 Mo-Ti and 18Cr-2 Mo-Ti, exhibited, however, only pitting type failure and this type of corrosion became inactive in the early period of test. Stress corrosion cracking in austenitic stainless steels, Type 304 and Type 316, took place at 60°C, but did not occur at 40°C in all runs. The extent of stress corrosion failure in Type 304 was more significant than those in Type 316. The corrosion actions in the presence of stress corrosion cracking continued throughout the test period except for one run in Type 304, but became inactive in Type 316 in the early period of test even in the presence of cracking.

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