20钢表面电脉冲沉积锌层及其耐蚀性能  

Corrosion Behavior of Zn Electro-Pulse Deposited Mild Steel

作　　者：齐慧滨[1] 张剑峰[1] 王德仁[1] 何业东[1] 

机构地区：[1]北京科技大学腐蚀与防护中心腐蚀磨蚀与表面技术开放研究实验室,100083

出　　处：《材料保护》2001年第6期13-15,共3页Materials Protection

基　　金：国家自然科学基金!(59801002);腐蚀科学国家重点实验室资助项目

摘　　要：用自制的高能高频电脉冲沉积设备在20钢上获得了表面平整、厚度均匀的锌涂层，对比研究 了涂层试样与未涂层试样在80 ℃的自来水和65 ℃的自来水、海水中的耐蚀性能。通过对电 位-时间关系曲线的监测发现，在80 ℃海水浸泡181 h和65 ℃自来水中浸泡4 h后出现了锌 -铁电偶对电位极性逆转现象，使锌涂层由阳极性转变为极性，并使腐蚀形态由均匀的全面 腐蚀转变为不均匀的局部腐蚀，使锌涂层失去了应有的保护作用。研究确定锌涂层较为适宜 的使用环境在80 ℃时为自来水、在65 ℃时为海水。建议在选用锌作防护涂层时针对实际使 用环境测试电位和腐蚀情况，避免由于涂层工作环境选择不当而引发相反的效果。A flat and even thickness zinc coating was prepared on 20 steel with high-energy and high frequency electropulse depositing technology. Comparisons were made on the corrosion resistance of uncoated and Zn coated samples in simulated sea water and common tap water at 65℃ and 80℃ respectively. The results showed that the weight-loss of Zn coated mild steel in sea water at 65℃ and in tap water at both 65℃ and 80℃ were obviously reduced compared with that of the uncoated steel. It was also shown that the polarity of Zn-Fe galvanic couple changed over after 181 hours in sea water at 80℃ and 4 hours in tap water at 65℃ . Correspondingly, the corrosion changed from general corrosion to local corroion. It was proposed that the electric potential and the corrosion form should be given while selecting zinc as protective coating material.

关 键 词：电脉冲沉积技术 锌涂层 耐蚀性能 20钢 

分 类 号：TG174.44[金属学及工艺—金属表面处理]