纯锆R60702板材焊接接头的腐蚀性能研究

发布时间：2018-04-26 13:18

本文选题：工业纯锆 + 醋酸　；参考：《稀有金属》2015年09期

【摘要】：采用挂片失重法,研究了工业纯锆R60702板材钨极氩弧焊焊接接头分别在沸腾条件下的10%,30%,70%(质量分数)浓度的硫酸和醋酸+2%KI+200 mg·kg-1Na Cl介质中的腐蚀性能,并分析了接头腐蚀后的表面形貌及腐蚀机制。实验结果表明,在相同浓度硫酸介质中,焊接接头的腐蚀速率均比母材腐蚀速率大;当硫酸腐蚀液浓度低于30%(包含30%)时,母材和焊接接头均具有优异的腐蚀性能;当硫酸腐蚀液浓度高于30%时,母材和焊接接头腐蚀速率显著增大,硫酸浓度对母材和焊接接头的腐蚀速率影响均较大;在相同浓度醋酸+2%KI+200 mg·kg-1Na Cl混合介质中,接头的腐蚀速率均比母材腐蚀速率小;当醋酸浓度小于70%时,浓度对母材和接头的腐蚀性能影响较小,这是因为焊缝区域的粗大组织降低了Cl-和I-吸附晶界引起的氧化膜局部破坏效应;工业纯锆R60702母材和焊接接头在硫酸介质中腐蚀方式均为全面腐蚀,在醋酸+2%KI+200 mg·kg-1Na Cl混合介质中的腐蚀方式为点蚀。
[Abstract]:The corrosion properties of TIG welded joints of industrial pure zirconium R60702 sheet in sulfuric acid and acetic acid 2%KI 200mg kg-1Na Cl medium under boiling condition were studied by means of hanging plate weight loss method. The surface morphology and corrosion mechanism of the joints after corrosion were analyzed. The results show that the corrosion rate of welded joints is higher than that of base metal in the same concentration of sulfuric acid solution, and when the concentration of sulphuric acid solution is lower than 30% (including 30%), both base metal and welded joints have excellent corrosion performance. When the concentration of sulfuric acid solution is higher than 30%, the corrosion rate of base metal and welded joint increases significantly, and the effect of sulfuric acid concentration on the corrosion rate of base metal and welded joint is great, and in the mixture of 2%KI 200mg kg-1Na Cl with the same concentration of acetic acid, the corrosion rate of base metal and welded joint increases significantly. The corrosion rate of the joint is lower than that of the base metal, and when the concentration of acetic acid is less than 70, the effect of the concentration on the corrosion performance of the base metal and the joint is small. This is because the coarse microstructure in the weld zone reduces the local damage of oxide film caused by Cl- and I- adsorbed grain boundaries, and the corrosion mode of industrial pure zirconium R60702 base metal and welded joints in sulfuric acid medium is comprehensive corrosion. The corrosion mode of acetic acid 2%KI 200mg kg-1Na Cl mixed medium is pitting.
【作者单位】：西安建筑科技大学冶金工程学院;中航工业西安飞机工业(集团)有限责任公司;
【基金】：陕西省科技统筹创新工程计划项目(2011KTIB01-03-04;2011KTIB01-03-03)资助
【分类号】：TG407

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