刘学庆, 苏文, 赵喜喜, 张守都, 田敬云, 马健, 李友训, 王健
青岛国家海洋科学研究中心, 山东 青岛 266071

摘要:
为研究河流入海口处盐度周期变化时铝牺牲阳极对钢结构的保护效果，测试对比了盐度固定与盐度循环条件下Q235钢有无阳极保护时的腐蚀失重和电位变化、铝牺牲阳极的电流效率。结果表明盐度循环会造成Q235钢的严重腐蚀，盐度差越大腐蚀越严重，甚至可能超过天然海水的腐蚀程度；在盐度循环条件下铝牺牲阳极对Q235钢具有良好的保护效果，但与稳定的盐度相比，阳极的消耗量增加、电流效率降低；在稳定的低盐度条件（0.5%）下，虽然铝牺牲阳极的电流效率较高，被保护的Q235钢电位足够负，但是保护效果不理想。本文通过Q235钢腐蚀失重数据检验铝牺牲阳极的保护效果，得到了不同盐度循环条件下铝牺牲阳极的初步性能数据，为河流入海口处钢结构设施的阴极保护提供了依据。
关键词:铝牺牲阳极盐度电流效率腐蚀失重
DOI：10.11759/hykx20201112003
分类号:TG174.41
基金项目:山东省重点研发计划项目（2019RZF01001）；山东省软科学研究计划项目（2018RKF01005）

Effect of salinity variation on the protective performance of Al sacrificial anode
LIU Xue-qing, SU Wen, ZHAO Xi-xi, ZHANG Shou-du, TIAN Jing-yun, MA Jian, LI You-xun, WANG Jian
Qingdao National Oceanographic Center, Qingdao 266071, China
Abstract:
To assess the performance of Al sacrificial anode in protecting steel structures under the condition of periodic salinity variation near estuaries, some factors, including the weight loss and potential of Q235 steel with and without the protection of Al sacrificial anode and the current efficiency of Al anode, were tested under the conditions of fixed and periodic salinities. The results showed that periodic salinity caused corrosion of Q235 steel and different salinities caused more severe corrosion than in natural seawater. The Al sacrificial anode exhibited a good protective performance on Q235 steel under the condition of periodic salinity but led to additional consumption and decreasing the current efficiency of the Al anode. Under the fixed low salinity of 0.5%, the Al sacrificial anode did not exhibit a good protective performance as expected even though its current efficiency was high and the potential of protected Q235 steel was sufficiently negative. This study tests the protective performance of the Al sacrificial anode based on the weight loss of Q235 steel and obtains the initial performance data of the Al anode under different periodic salinities. It also provides a reference for the cathodic protection of steel structures near estuaries. Thus, new anode materials or corrosion prevention techniques to protect steel structures near estuaries need to be developed.
Key words:Al sacrificial anodesalinitycurrent efficiencyweight loss





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