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采用电化学方法、电偶实验、EPMA和ICP-MS对不同Fe含量的Al-Zn-In-Mg-Ti-Si牺牲阳极在海水中的电化学性能进行了研究。结果表明,铝合金牺牲阳极随着Fe含量的增加,Fe的析出相随之增多。Fe主要富集在晶界处,少数呈点状在晶内弥散分布。Al-5Zn-0.02In-1Mg-0.05Ti-0.12Si-0.1Fe合金的阳极表面溶解均匀,工作电位处于-1.047~-1.068V之间,电流效率达到93%以上,耦合电位较负且稳定,耦合电流较高,2 h时的Al和Zn溶解量为2.2×10-8和3.8×10-9g/L,48 h时的扫描电流峰值为36 mA,增加了溶解活性点,铝合金的溶解均匀性得到增强。而Fe含量超过0.1%后,会限制In的活化作用,活性溶解阻力逐渐增大,电流效率明显下降。Fe含量为0.1%的Al-Zn-In-Mg-Ti-Si合金具有较好的阳极性能。
The electrochemical performance of Al-Zn-In-Mg-Ti-Si sacrificial anodes with different Fe content in seawater was investigated by electrochemical method, galvanic coupling experiment, EPMA and ICP-MS. The results show that with the increase of Fe content, the precipitated phase of Fe increases with the sacrificial anode of aluminum alloy. Fe is mainly concentrated in the grain boundaries, a small number of spots were dispersed within the crystal. The anode surface of Al-5Zn-0.02In-1Mg-0.05Ti-0.12Si-0.1Fe alloy dissolves uniformly, the working potential is between -1.047 ~ -1.068V, the current efficiency reaches over 93%, the coupling potential is more negative and stable, The coupling current is high, the amount of dissolved Al and Zn is 2.2 × 10-8 and 3.8 × 10-9g / L at 2 h, and the peak current is 36 mA at 48 h, which increases the dissolution active point and the dissolution of aluminum alloy Uniformity is enhanced. When the content of Fe exceeds 0.1%, the activation of In will be limited, the resistance of active dissolution will increase gradually and the current efficiency will decrease obviously. The Al-Zn-In-Mg-Ti-Si alloy with 0.1% Fe has better anode performance.