目的 采用微弧氧化（MAO）在TA2表面形成陶瓷绝缘层，以显著减弱或消除TA2与10CrNiCu钢连接构件的电偶电池作用。方法 采用不同氧化时间获得了2种MAO膜厚度的试样，通过电偶对试样的挂片实验及模拟电偶对的电化学实验，研究了微弧氧化处理对10CrNiCu/TA2电偶对在3.5%NaCl溶液中腐蚀行为的影响，研究了模拟电绝缘电偶对的电化学实验方法。结果 在TA2与10CrNiCu之间形成的MAO膜可显著降低它们之间的电偶电池作用，MAO膜厚度的增加可以提高电绝缘的效果，当MAO膜厚度约为25 μm时，电偶对挂片试样中10CrNiCu的腐蚀速度仅比自腐蚀时大约7%。当整体微弧氧化的TA2与10CrNiCu短路连接时，随着浸泡时间的延长，其电偶电流反而会大于10CrNiCu/TA2电偶对。在10CrNiCu/TA2电偶对中串联MAO样品以模拟电绝缘层时，MAO膜的质量对电绝缘效果有明显的影响，质量良好的MAO膜可显著抑制电偶腐蚀。结论 MAO膜的电绝缘效果良好，当MAO膜厚度大于25 μm时，可基本消除TA2与10CrNiCu之间的电偶电池作用。由于湿态MAO样品与电阻有明显的差异，串联湿态MAO样品的电偶对与实际的10CrNiCu/TA2接头也有明显差异，在电偶对中串联绝缘材料不能准确模拟电绝缘异金属连接接头。

The work aims to reduce significantly or eliminate the action of galvanic cell in the joint between TA2 and 10CrNiCu steel by depositing the ceramic coating with insulation property on the TA2 surface through micro-arc oxidation (MAO) treatment. Two kinds of MAO coating samples with different thickness were obtained by using different anodizing time. The effect of MAO treatment on corrosion behavior of 10CrNiCu/TA2 galvanic couple in 3.5%NaCl solution was investigated through coupon tests of the galvanic couple samples and electrochemical tests of simulated galvanic couple. The electrochemical test method of simulated galvanic couple with electric insulation properties was also studied. The MAO coating on TA2 surface between TA2 and 10CrNiCu could reduce significantly the action of galvanic cell, and the action of electric insulation increased as the MAO coating thickness improved. When the MAO coating thickness was about 25 μm, the corrosion rate of 10CrNiCu in the galvanic couple sample was only 7% higher than the free corrosion rate. When TA2 treated by entire MAO was connected with 10CrNiCu by short-circuit, the galvanic current of as-obtained couple might be higher than that of 10CrNiCu/TA2 couple with the increase of immersion time. When the MAO sample was added into 10CrNiCu/TA2 couple by series connection to simulate the electric insulation coating, the quality of MAO coating might influence the action of insulation obviously. MAO coating with high quality could inhibit galvanic corrosion significantly. The MAO coating has good electric insulation, and the action of galvanic cell between TA2 and 10CrNiCu can be eliminated completely when the thickness of MAO coating is larger than 25 μm. Wet MAO is obviously different from electric resistance, so the 10CrNiCu/TA2 galvanic couple by series connection with wet MAO is also different from the actual 10CrNiCu-TA2 joint treated by electric insulation and the actual electric insulation joint between different metals cannot be simulated accurately by adding insulation material into galvanic couple by series connection.