尾矿库埋入式传感器不锈钢外壳腐蚀研究  

Corrosion of Stainless Steel Shell of Embedded Sensor in Tailings Pond

作　　者：王淇萱 吕文生[2] 杨鹏[2,3] 诸利一 廖文景 朱远乐 WANG Qixuan;LYU Wensheng;YANG Peng;ZHU Liyi;LIAO Wenjing;ZHU Yuanle(State Key Laboratory of Safety Technology for Metal Mines,Changsha Institute of Mining Research Co.Ltd.,Changsha 410012,China;Beijing University of Science and Technology College of Civil Engineering and Resources,Beijing 100083,China;Key Laboratory of Beijing Information Service Engineering,Beijing Union University,Beijing 100101,China)

机构地区：[1]长沙矿山研究院有限责任公司,金属矿山安全技术国家重点实验室,长沙410012 [2]北京科技大学土木与资源工程学院,北京100083 [3]北京联合大学,北京市信息服务工程重点实验室,北京100101

出　　处：《中国腐蚀与防护学报》2022年第2期331-337,共7页Journal of Chinese Society For Corrosion and Protection

基　　金：国家重点研发计划(2017YFC0804604);湖南省应急管理厅安全生产预防及应急专项(Hunan-201905)。

摘　　要：针对尾矿库埋入式监测仪器或传感器在不同的地下环境中腐蚀严重、经济损失大等问题,采用挂片浸泡、扫描电镜(SEM)、失重法和电化学测试相结合的方法研究了传感器外壳材料(以316L不锈钢为研究对象)在酸性环境和盐卤环境中的腐蚀规律。结果表明,在pH1.5的酸性腐蚀环境中,不锈钢试样短期内钝化膜处于逐渐形成状态,耐蚀性越来越好;经过长期1 a浸泡腐蚀后,耐蚀性略微有所降低;在pH3的硫酸与卤水混合液和pH7.5盐卤水的腐蚀环境中,不锈钢试样短期内耐蚀性越来越好;经过长期浸泡腐蚀后,由于盐卤水中侵蚀性Cl-的存在加速了钝化膜的溶解和破坏,耐蚀性下降幅度明显增大。Aiming at the problem related with serious corrosion and large economic loss of embedded monitoring instruments or sensors in different underground environments, the corrosion behavior of shell material(316 L stainless steel) of embedded monitoring sensors in acid-and brine-containing simulated environments of tailings ponds were studied by means of coupon immersion with mass loss method, electrochemical measurement and scanning electron microscopy(SEM). The results show that in the acid containing artificial solution of pH1.5, the passive film is gradually formed on the 316 SS surface in a short period of time, and the corrosion resistance is getting better and better. However, the corrosion resistance of the 316 SS is slightly reduced after a long-term immersion corrosion. In the artificial solution containing mixed sulfuric acid and brine of pH3, and that containing brine of pH7.5 respecyively, the corrosion resistance of the 316 SS is better in the short term The existence of corrosive Cl-in brine accelerated the dissolution and destruction of the passive film, and the corrosion resistance decreased significantly.

关 键 词：尾矿库 316L不锈钢 腐蚀速率 极化曲线 电化学阻抗谱 

分 类 号：TG174[金属学及工艺—金属表面处理]