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采用小尺寸试样的NACE(美国腐蚀工程师协会)法和SNEA(P)[法国Elf阿坤廷全国协会(产品)]法仅在以下两个方面存在差别:(1)气体性质不一:NACE法用纯H_2S试验,而SNEA(P)法用拉克气体(CH_4+15%H_2s+9%CO_2)试验;(2)溶液中添加的HA_c量不一:NACE法添加0.5%HA_(?),而SNEA(P)法添加HAC的量只是将溶液调节到pH4。然而,就因这两个差别却给材料分类带来失真,NACE法对那些在高应力下对H_(?)S氢脆较为敏感的材料和不锈钢可能给以不确切的评价。相反,具有初始pH4的改型NACE法可获得十分类似于SNEA(P)法之结果,该法显示出更能代表实际使用条件。本文的结果指出,采取一定实验措施,用小直径光滑拉伸试样作延迟断裂试验是完全可行的。
The NACE (American Society of Corrosion Engineers) method and the SNEA (P) [French Elf National Association of Aquatics (France)] method using small sample sizes differ only in two ways: (1) different gas properties: NACE (2) The amount of HA_c added in the solution was different: 0.5% HA_ (?) Added by NACE method, The amount of HAC added to the SNEA (P) method merely adjusted the solution to pH 4. However, because of these two differences, the material classification is distorted. The NACE method may give inaccurate evaluation of materials and stainless steels that are more susceptible to H_ (?) S hydrogen embrittlement under high stress. In contrast, the modified NACE method with an initial pH of 4 yielded results very similar to those of the SNEA (P) method, which showed a better representation of the actual conditions of use. The results of this paper point out that it is totally feasible to adopt some experimental measures to test the delayed fracture with small diameter and smooth tensile specimens.