输变电用Q345HN耐候钢铁塔异材搭接螺栓的电偶腐蚀行为  

Galvanic Corrosion Behavior of Different Bond Bolts in Q345HN Weathering Steel Tower for Power Transmission and Transformation

作　　者：王凌旭 何锦航 孙博 白洁 王勇 邓凤淋 曹长胜 张鹏 华建坤 梁宇[3] WANG Lingxu;HE Jinhang;SUN Bo;BAI Jie;WANG Yong;DENG Fenglin;CAO Changsheng;ZHANG Peng;HUA Jiankun;LIANG Yu(Electric Power Insisturte of Guizhou Power Grid Co.,Ltd.,Guiyang 550002,China;ProwerChina Gruizhou Electric Power Engineering Co.,Ltd.,Guiyang 550002,China;Guizhou University,Guiyang 550025,China)

机构地区：[1]贵州电网有限责任公司电力科学研究院,贵阳550002 [2]中国电建集团贵州电力设计研究院有限公司,贵阳550002 [3]贵州大学,贵阳550025

出　　处：《腐蚀与防护》2022年第10期94-98,109,共6页Corrosion & Protection

基　　金：贵州电网有限责任公司电力科学研究院项目(066600KK52180066)。

摘　　要：采用盐雾试验,研究了输变电用Q345HN耐候钢铁塔异材搭接螺栓连接件的电偶腐蚀行为,探明了304SS与镀锌碳钢螺栓对耐候钢母材的腐蚀影响,结合数值模拟方法,分析了不同材质螺栓-母材的电偶电流场分布。结果表明:镀锌层不能有效保护耐候钢,受阴极电流影响,耐候钢阳极氧化过程反而受到抑制,螺栓周边难以形成致密氧化层;不锈钢会加速螺栓周边耐候钢的阳极过程,但在阳极极化条件下,耐候钢锈层组织疏松且不具有保护特性。The galvanic corrosion behavior of dissimilar lap bolt connections of Q345 HN weather-resistant steel towers for power transmission and transformation was studied by salt spray test. The corrosion effects of 304 SS and galvanized carbon steel bolts on the base metal of weathering steel were investigated. Combined with numerical simulation methods, the galvanic current field distribution of bolts and base metals of different materials was analyzed. The results showed that the galvanized layer could not effectively protect the weathering steel. Affected by the cathodic current, the anodic oxidation process of the weathering steel was inhibited, and it was difficult to form a dense oxide layer around the bolt. Stainless steel would accelerate the anodic process of weathering steel around the bolt, but under the condition of anodic polarization, the rust layer of weathering steel was loose and has no protective properties.

关 键 词：耐候钢 电偶腐蚀 螺栓腐蚀 

分 类 号：TG178[金属学及工艺—金属表面处理]