Yan Xudong, Sun Jianlin, Meng Yanan
School of Materials Science and Engineering, University of Science and Technology Beijing Beijing 100083 China
RSC Adv. 2018 Mar 9;8(18):9833-9840. doi: 10.1039/c8ra00432c. eCollection 2018 Mar 5.
Chemical corrosion mechanism of copper in an oil-in-water (O/W) emulsion is worthy of study since it would contribute to emulsion-lubrication in a metal-working process and for copper storage. The immersion experiments were carried out and the corrosion rates were measured using the weight-loss method. Surface morphology of the copper specimen was observed using a scanning electron microscope (SEM). The compositions of the corrosive residues were analyzed using an energy dispersive spectrometer (EDS) and an X-ray photoelectron spectrometer (XPS). It was found that the corrosion rate of copper in an emulsion linearly increases and the kinetics relationship could be deduced as = 2.66 × 10 at room temperature (25 °C). After 1488 h of immersion time, the corrosion products on the copper surface were determined to be CuO, CuO, Cu(OH), CuCO and Cu(OH)CuCO, which also changed the appearance of the emulsion. During adsorption, copper is more likely to coordinate with hydroxide, carboxylate or ester anions to generate copper compounds. The surfactants were consumed and the efficiency of emulsification characteristics was lost and finally, the O/W emulsion separated into two layers, which might hint the significance of introducing an inhibitor to protect the copper surfaces.
铜在水包油（O/W）乳液中的化学腐蚀机制值得研究，因为这有助于金属加工过程中的乳液润滑以及铜的储存。进行了浸泡实验，并采用失重法测量了腐蚀速率。使用扫描电子显微镜（SEM）观察了铜试样的表面形貌。使用能量色散光谱仪（EDS）和X射线光电子能谱仪（XPS）分析了腐蚀残渣的成分。结果发现，室温（25°C）下铜在乳液中的腐蚀速率呈线性增加，动力学关系可推导为 = 2.66 × 10 。浸泡1488小时后，确定铜表面的腐蚀产物为CuO、CuO、Cu(OH)、CuCO 和Cu(OH)CuCO，这也改变了乳液的外观。在吸附过程中，铜更倾向于与氢氧根、羧酸根或酯阴离子配位生成铜化合物。表面活性剂被消耗，乳化特性的效率丧失，最终，O/W乳液分成两层，这可能暗示了引入抑制剂保护铜表面的重要性。
