牺牲阳极保护对Q235B钢在模拟海洋潮差区间腐蚀行为的影响  

THE EFFECT OF SACRIFICIAL ANODE ON CORROSION PROTECTION OF Q235B STEEL IN SIMULATED TIDAL ZONE

作　　者：穆鑫[1] 魏洁[1] 董俊华[1] 柯伟[1] 

机构地区：[1]中国科学院金属研究所,沈阳110016

出　　处：《金属学报》2014年第11期1294-1304,共11页Acta Metallurgica Sinica

基　　金：国家自然科学基金项目51131007;国家重点基础研究发展计划项目2014CB643300;国家材料环境腐蚀平台项目资助~~

摘　　要：利用自制的腐蚀实验槽模拟实海潮差,并借助电化学工作站原位监测受牺牲阳极保护的Q235B钢在潮差区间不同位置的电极电位.结果表明,在牺牲阳极保护下,Q235B钢长尺试样在潮差区间具有一定的保护效果,腐蚀程度随潮位的降低而减轻,被保护的高度随着牺牲阳极面积的增大而升高;决定牺牲阳极保护效果好坏的主要是试样曝露在空气中以后的表面电流电阻降(IR降)大小,IR降越小保护效果越好.片面增加牺牲阳极的面积虽可提高钢铁构件的保护效果,但有时会使构件的一部分处于过保护状态,牺牲阳极和其他保护措施有效配合是解决潮差区腐蚀问题的途径.The environment of the tidal zone is very complex. The interactions of dry-wet alternation and sea erosion lead to serious corrosion of steel structures, which makes it difficult to adopt protective methods. Therefore, it is of great significance to study the corrosion and protection methods of steel in tidal zone. At present, the widely used protection method in tidal zone is coating which is effective in short term. However, it is easy to cause blister failure during the long-term service process, and it will increase the maintenance cost. Sacrificing anode protection is the most common method used in the seawater environment due to its advantages such as low cost, simple operation, no external current, no interference with adjacent metal facilities, good current dispersion ability,easy management and maintenance and high efficiency, etc.. However, in the tidal zone, sacrificial anode protective is effective only when the protected metal is in seawater immersion state. After the tide receded, the protected metal exposes in air. At this time, the current loop is destroyed, and the sacrificial anode protection effect is weakened. Therefore, it is commonly known that the sacrificial anode protection method can not protect the whole tidal zone against corrosion. At present, the corrosion process and mechanism of steel structures under sacrificial anode protection in the tidal zone are not clear. In order to study the corrosion mechanism of sacrificial anode protection,a corrosion experimental trough was designed to simulate the tidal zone and immersion zone. The electrode potential of Q235 B mild steel under different protecting area of sacrificial anode in it was monitored in situ by the electrochemical workstation. The results show that under the sacrificial anode protection, the long scale specimen of Q235 B steel is protected well, the corrosion degree in the tidal zone gradually reduces with the decrease of tide level, and the protected height increases with the increase of sacrificial anode area. Protective e

关 键 词：室内模拟 海洋潮差腐蚀 低碳钢 牺牲阳极 电极电位 

分 类 号：TG172.5[金属学及工艺—金属表面处理]