工业纯钛与铜镍合金的电偶腐蚀及电绝缘控制

Galvanic Corrosion and Insulation Control between Industrial Pure Titanium and Albata

采用电偶腐蚀试验方法研究了工业纯钛（TA2）与铜镍合金（B10）在不同面积比及不同海水流速条件下的电偶腐蚀倾向以及腐蚀程度,通过在两电偶对材料间串联不同阻值的绝缘电阻考察能有效防止电偶腐蚀发生的电绝缘判据。结果表明,TA2与B10在海水中具有较强的电偶腐蚀倾向,偶接后B10作为阳极腐蚀加重,且随着TA2/B10面积比的增大和海水流速的提高而加剧;试验条件下,两电偶对材料间绝缘电阻阻值高于56 kΩ时,可有效控制电偶腐蚀的发生。

Galvanic corrosion tendency and degree between industrial pure titanium（TA2） and albata（B10） in seawater of different velocities with different area ratios of cathode/anode were investigated by the galvanic corrosion experiments.The electrical insulation criterion of TA2 and B10 was studied by connecting different insulated resistances between TA2 and B10.The results showed that the galvanic corrosion tendency between the two materials was evident.The corrosion rates of B10 increased after coupling,and increased with the increase of area ratio of cathode/anode and the increase of the seawater flowing velocity.Under the test conditions,the galvanic corrosion could be avoided when the contacting resistance was higher than 56 kΩ.