纳米有机涂层对低合金钢在典型填埋介质中的初期腐蚀保护特征研究  

Study on the Initial Corrosion Protection of Nano-Organic Coating for Low Alloy Steel in Typical Landfill Media

作　　者：杨奔奔[1] 杨进超[1] 赵华宇 李莎莎[1] 蔡溪南[1] 林锐 芦玉峰[1] YANG Ben-ben;YANG Jin-chao;ZHAO Hua-yu;LI Sha-sha;CAI Xi-nan;LIN Rui;LU Yu-feng(Northwest Institute of Nuclear Technology,Xi’an 710024,China)

机构地区：[1]西北核技术研究所,陕西西安710024

出　　处：《材料保护》2020年第3期23-26,40,共5页Materials Protection

摘　　要：为了研究填埋环境下纳米有机涂层对低合金钢的保护特征,利用耦合多电极矩阵传感器系统对低合金钢在填埋环境下的腐蚀进行连续监测,其中填埋介质选用的是轻集料混凝土和膨润土2种典型填埋材料。监测结果表明,涂装纳米有机涂层的探针在这2种典型回填介质中的初期腐蚀速率均较小,而且腐蚀监测数据均存在一条近似的"腐蚀速率回归线",腐蚀速率波动明显,尤其是在膨润土中。同时结合填埋试样的实际状态和EIS谱测试结果,在填埋介质的初期腐蚀阶段,纳米有机涂层主要是通过锌粉的阴极保护作用对低合金钢进行有效保护,这种保护作用正是腐蚀速率呈现波动的成因,而监测结果中"腐蚀速率回归线"表征的是涂装纳米有机涂层的低合金钢在填埋介质中的实际腐蚀速率。The initial corrosion of low-alloy steel coated with nano-organic coating in the landfill environment was continuously monitored by a coupled multi-electrode matrix sensor system,and the selected two landfill media were light aggregate concrete and bentonite,respectively.Results showed that the initial corrosion rate of the probes coated with nano-organic coatings in these two typical backfill media was small. An approximate "corrosion rate regression line"existed in the corrosion monitoring data,and the corrosion rate fluctuated significantly,especially in bentonite. Meanwhile,combined with the actual state of the landfill sample and the EIS test results,in the initial corrosion stage of the landfill medium,the nano-organic coating mainly protected the low-alloy steel by the cathodic protection of the zinc powder,which was the cause for fluctuation of corrosion rate. Furthermore,the"corrosion rate regression line"in the monitoring results reflected the actual corrosion rate of the low-alloy steel coated with the nano-organic coating in the landfill medium.

关 键 词：纳米有机涂层 腐蚀保护 在线监测 低合金钢 回填材料 

分 类 号：TG174.4[金属学及工艺—金属表面处理]