粉状锈对青铜器腐蚀影响的电化学研究及其形成机理

Formation Mechanism of Powder-Like Rust and Its Influence on Corrosion of Bronze Wares Studied by Electrochemical Methods

为了研究腐蚀产物对青铜器腐蚀的影响,分别以多种不溶性铜盐作为活性催化物质,制备成了多孔氧电极,使之与青铜阳极组成原电池。以电流密度为0.01mA/cm2进行了连续115h以上的放电试验,并对氧电极进行了阴极极化测试。本试验较好地模拟了青铜器在大气条件下的电化学腐蚀过程,验证了铜盐中催化活性最高的是氯化亚铜而不是碱式氯化铜即粉状锈,粉状锈仅是腐蚀的最终产物。提出了多孔氧电极催化机理。

Several kinds of insoluble nantokite were used as active catalysts to prepare porous oxygen electrodes. Resultant porous oxygen electrodes were combined with bronze anode to produce primary batteries. The primary batteries were continuously discharged at a current density of 0.01 mA/cm2 for more than 115 h, and the cathodic polarization of the porous oxygen electrodes was tested. The catalytic mechanism of the porous oxygen electrodes was discussed. It was found that the discharge test could be well used to simulate the electrochemical corrosion process of bronze wares under atmosphere. Cuprous chloride rather than basic cupric chloride was the nantokite with the highest catalytic activity for the corrosion process of bronze wares, and the powder-like rust was just the final corroded product.