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.
出处
《材料保护》
CAS
CSCD
北大核心
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
