求氯离子应力腐蚀的外文资料！？ 建议楼主用关键词到网上找找：chloride ion, stress corrosion chloride stress corrosion cracking the stainless steels used today in almost all climbing bolts are susceptible to a failure mechanism called chloride stress corrosion cracking or scc. just like it sounds, the chlorine ion, which results from dissolving salt in water, and stress must both be present. a typical multi-piece expansion bolt has the shaft in tension, and the hanger has complex stresses placed on it when it is clamped against the rock as you tighten the nut. this type of bolt placed in a sea cliff is a bomb with a short fuse. once started, scc spreads like a disease following the stress lines in the steel, much like grass grows in small cracks in concrete and forces the pieces apart. the cracks get larger over time, and soon the microscopic grains of the metal are no longer in contact. although scc can occur on any part of a bolt exposed to salt water, it usually occurs under the hanger where salt water wicks into the crevice between the hanger and the rock su**ce. bolts corroded by scc typically break flush with the su**ce of the rock. hangers typically break at the ninety-degree bend, and nuts can crack just about anywhere. at least one bolt vendor sells stainless steel "clad" bolts and nuts. these have a thin outer cladding of stainless steel surrounding a core of mild steel. this type of bolt seems to be worse then others, since once scc cracks the cladding, oxidation (rust) finishes the job in short order. if you see a stainless bolt with a rust "beard" on the rock under it, beware! [ ]查看更多
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