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(上接2012年第5期第80页)材料组织结构的不均匀会使点蚀倾向增加。如钢中非金属夹杂物MnS常成为点蚀的起源,奥氏体不锈钢中的δ铁素体,不锈钢中的σ相,铁素体不锈钢中的α、相,敏化的晶界及焊接区等都可能使钢的耐点蚀性能降低;时效的含Cu含Mg的铝合金,因存在Al2CuMg相,使点蚀敏感性增大;剧烈的冷加工会使不锈钢在三氧化二铁中的点蚀倾向增大,在大多数不锈钢锻材上常可观察到点钢在边缘部位优先产生。
(Continued on 2012, No. 5, p. 80) uneven material structure will increase pitting corrosion. Such as steel, non-metallic inclusions MnS often become the origin of pitting corrosion, δ ferrite in austenitic stainless steel, σ phase in stainless steel, α, phase, sensitized grain boundaries and weld zone in ferritic stainless steel Can all reduce the pitting corrosion resistance of the steel. The aged Cu-containing aluminum alloy has the pitting sensitivity increased due to the presence of Al2CuMg phase. Severe cold working can cause pitting corrosion of the stainless steel in the ferric oxide Tend to increase in the majority of stainless steel forgings can often be observed in the edge of the steel point to give priority to produce.