海水介质中环境友好型紫铜缓蚀剂的缓蚀性研究(英文)

Friendly Inhibitor for Corrosion Inhibition of Copper in Sea Water

采用失重法、极化曲线、电镜扫描和XPS能谱分析等方法对苯并三氮唑(BTA)及其复合缓蚀剂对海水中紫铜的缓蚀性能及缓蚀机理进行了研究。实验结果表明:单独使用BTA浓度达到150mg·L-1时,缓蚀率大于90%;BTA与柠檬酸钠复配后,缓蚀率有了很大提高,当BTA浓度为2mg·L-1,柠檬酸钠浓度为20mg·L-1时,缓蚀率达到96.0%,腐蚀速率为0.01014mm/a,缓蚀剂成本大大降低。极化曲线试验结果表明,BTA缓蚀剂在海水中为阴极型缓蚀剂,BTA与柠檬酸钠复合缓蚀剂为混合型缓蚀剂。对添加了缓蚀剂的海水中的紫铜表面进行的扫描电镜测试及XPS能谱分析的实验结果表明:添加了BTA和柠檬酸钠缓蚀剂的紫铜表面光滑,基本没有腐蚀;且在试片表面形成了缓蚀剂各组分均参与成膜的非水溶性保护层,有效的抑制了紫铜在海水中的溶解腐蚀。

The inhibition and mechanism of corrosion of copper in sea water with and without inhibitors had been investigated by using weight- loss, electrochemical polarization and suface analysis technique SEM and XPS. It had been found that there was synergistic effect between BTA and sodium citrate. The inhibition efficiency was 96. 0%, and corrosion rate was 0. 00431mm/a in the proportion of 2 mg · L ^- 1 BTA and 20 mg · L^ - 1 sodium citrate inhibitor. It was a mixture inhibitor. The SEM images show that the surface of copper without inhibitors which was heavily corroded; but the surface of copper with inhibitors remained shiny after immersed in seawater after 6 day. The results of the XPS spectrum of the surface of copper indicated that the compound inhibitor formed a Cu （ Ⅰ ） - BTA and Cu （ Ⅰ ） -complex film on copper surface. The film was insoluble and would block the Cu dissolving as Cu ^＋ and Cu^2 ＋ ions in sea water.