首页> 外文会议>NACE International CORROSION/2005 Conference >EFFECT OF SIMULATED GROUNDWATER CHEMISTRY ON STRESS CORROSION CRACKING OF ALLOY 22
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EFFECT OF SIMULATED GROUNDWATER CHEMISTRY ON STRESS CORROSION CRACKING OF ALLOY 22

机译:模拟地下水化学对合金22应力腐蚀开裂的影响

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Slow strain rate tests were performed to evaluate the effect of simulated groundwater chemistry variations on the stress corrosion cracking (SCC) susceptibility of mill-annealed Alloy 22. Tests were conducted in which the constituent anionic species were removed selectively from simulated concentrated water (SCW). SCC was observed in SCW and its variations [removal of nitrate, sulfate, fluoride or chloride] at a high anodic potential of 0.4 VSCE at 95EC (203EF). Although the bicarbonate ion is the predominant constituent in SCW causing SCC, a synergistic effect exists between the bicarbonate and chloride ions. At a constant bicarbonate level, the susceptibility of Alloy 22 to SCC increases with increasing chloride ion concentrations. No SCC was observed in sodium chloride plus sodium nitrate solutions in the absence of bicarbonate.
机译:进行了慢应变速率测试,以评估模拟的地下水化学变化对轧制退火合金22的应力腐蚀开裂(SCC)敏感性的影响。进行了测试,从模拟浓水(SCW)中选择性去除了组成阴离子物质。 。在95EC(203EF)上,在0.4 VSCE的高阳极电位下,在SCW中观察到SCC及其变化[去除硝酸盐,硫酸盐,氟化物或氯化物]。尽管碳酸氢根离子是SCW中引起SCC的主要成分,但碳酸氢根和氯离子之间存在协同作用。在恒定的碳酸氢根含量下,合金22对SCC的敏感性随氯离子浓度的增加而增加。在不存在碳酸氢盐的情况下,在氯化钠和硝酸钠溶液中未观察到SCC。

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