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96436 ALLOYING EFFECTS ON DISSOLUTION RATE OF CREVICE CORROSION FOR AUSTENITIC STAINLESS STEELS IN 3% NaCl SOLUTION AT 80°C

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Product Number: 51300-96436-SG
ISBN: 96436 1996 CP
Author: Peter Chen, Tadashi Shinohara, Shigeo Tsujikawa
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Chloride stress corrosion cracking (SCC) has been a problem for austenitic stainless steel in aqueous environments containing chlorides. Studies have found that SCC initiates only from a dissolving surface and under the condition that the crack growth rate is higher than the dissolution rate of the dissolving surface. Research conducted to improve the resistance to SCC for Type 304 steels (UNS S30400) have revealed that while molybdenum and phosphorus are unfavored, the combined alloying of 3% aluminum with 2% copper can almost nullify their detrimental effect. Based on the mentioned criteria, this study was dedicated to clarify the mechanism behind these alloying effects by examining the relationship between the measured enhancements on SCC resistance and the dissolution rate observed via the moire technique. It was found that the addition of both molybdenum and phosphorus reduces the dissolution rate and therefore impaired SCC resistance; the addition of copper increases the dissolution rate of steady growth stage where crevice corrosion proceeds at a constant rate. Moreover this dissolution rate could further be increased when combined with the alloying of aluminum. These observed results correspond well to that of the measured behavior of the SCC critical temperature, TC, suggesting that the SCC susceptibility is influenced by anodic dissolution. Keywords: stress corrosion cracking, crevice corrosion, stainless steel, alloying effect, molybdenum, phosphorus, aluminum, copper, dissolution rate, repassivation potential
Chloride stress corrosion cracking (SCC) has been a problem for austenitic stainless steel in aqueous environments containing chlorides. Studies have found that SCC initiates only from a dissolving surface and under the condition that the crack growth rate is higher than the dissolution rate of the dissolving surface. Research conducted to improve the resistance to SCC for Type 304 steels (UNS S30400) have revealed that while molybdenum and phosphorus are unfavored, the combined alloying of 3% aluminum with 2% copper can almost nullify their detrimental effect. Based on the mentioned criteria, this study was dedicated to clarify the mechanism behind these alloying effects by examining the relationship between the measured enhancements on SCC resistance and the dissolution rate observed via the moire technique. It was found that the addition of both molybdenum and phosphorus reduces the dissolution rate and therefore impaired SCC resistance; the addition of copper increases the dissolution rate of steady growth stage where crevice corrosion proceeds at a constant rate. Moreover this dissolution rate could further be increased when combined with the alloying of aluminum. These observed results correspond well to that of the measured behavior of the SCC critical temperature, TC, suggesting that the SCC susceptibility is influenced by anodic dissolution. Keywords: stress corrosion cracking, crevice corrosion, stainless steel, alloying effect, molybdenum, phosphorus, aluminum, copper, dissolution rate, repassivation potential
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