摘要
采用测试动电位极化曲线和交流阻抗谱(EIS)的方法,分析研究了TA2-Q345爆炸复合板在人工海水中的电化学腐蚀性能,并与覆层母材TA2工业纯钛的电化学腐蚀性能进行了对比。结果表明,TA2纯钛和钛-钢复合板在试验条件下都表现出钝性,腐蚀速率都很小,并未发现明显点蚀现象。但是相比较而言,纯钛的腐蚀电流更小,钝化膜更为稳定,耐腐蚀性能更好;而复合板的耐腐蚀性能略有下降。这可能是由于爆炸焊接中,合金元素的扩散导致复合板结合界面靠近钛侧焊缝区出现有α-Fe相以及绝热剪切线和局部熔融物产生从而导致复合板的耐蚀性能有所降低。不过总体上钛-钢复合板仍具有很好的耐蚀性能,能够满足实际工程结构对复合板耐蚀性能要求。
The electrochemical corrosion resistance of TA2 - Q345 composite plate with explosion welding is investigated with dynamic potential polarization curve and electrochemical impedance spectroscopy （EIS） measurement respectively, and the results are compared with those of TA2 pure titanium. The comparison shows that both of the pure titanium TA2 and composite plate TA2 - Q345 exhibit passivity, lower corrosion rates and no obvious pitting corrosion. The corrosion resistance of pure titanium is excellent, while the corrosion resistance of the composite plate decreases slightly because of the corrosion current of pure titanium is smaller and the passivation film is more stable. As the result, the corrosion resistance is much better. Whereas, the corrosion resistance of composite plate is reduced. It is probably due to that the a - Fe phase is formed in the weld of composite plate at the side of titanium after explosion welding caused by diffusion of alloy element and that the adiabatic shear line and liquid melting occurred in the welds. Consequently, the corrosion resistance of composite plate decreases to a certain extent. On the whole, the composite plate offers better corrosion resistance, and it can satisfy the requirements of practical engineering structures for corrosion resistance.
出处
《石油化工腐蚀与防护》
CAS
2013年第1期20-23,30,共5页
Corrosion & Protection In Petrochemical Industry
关键词
爆炸焊接
钛钢复合板
极化曲线
交流阻抗谱
explosion welding, titanium - steel composite plate, polarization curve, electrochemical impedance spectroscopy
