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一、实验我厂以往采用HF—HNO_3—HCl系溶液酸洗18—8不锈钢半成品(经880℃退火),酸洗后须经深拉延加工(冷拉)。成品放置一定时间后大批出现开裂(图1b)。经考证是由于冷加工应力的存在下酸洗产生晶间侵蚀而导致的应力腐蚀开裂。我们曾尝试采用酸洗后电解(电解液为碱液)除应力法,但效果不佳,而且使产品表面出现点腐蚀。针
First, the experiment I used to use the factory HF-HNO_3-HCl solution pickling 18-8 stainless steel semi-finished products (after annealing at 880 ℃), after pickling to be deep drawing processing (cold drawing). Finished product after a certain period of time a large number of cracking (Figure 1b). The research is due to the presence of cold working stress pickling produce intergranular erosion caused by stress corrosion cracking. We have tried to use after pickling electrolysis (electrolyte is lye) stress method, but the effect is not good, and the product surface pitting corrosion. needle