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研究了AM50裸镁合金及在裸镁合金上进行阴极电泳处理、硅烷预处理再阴极电泳处理3种不同样件与Q235钢螺栓连接在5%NaCl水溶液中浸泡的腐蚀规律,仔细观察对比3种不同表面状态的镁合金在不同时间浸泡后的表面腐蚀情况,测定各自的腐蚀速率,对腐蚀后的区域进行微观分析,并用腐蚀模型对其腐蚀的行为规律进行了解释。结果表明:镁合金可以通过阴极电泳处理获得耐蚀防护涂层,硅烷预处理可以进一步提高电泳膜层与基体的附着力,从而大大提高镁合金与钢螺栓接触的耐电偶腐蚀性;AM50镁合金与Q235钢螺栓接触电偶腐蚀的影响区面积不随腐蚀时间的延长而增大,其电偶腐蚀速度沿纵深方向(与螺栓接触方向)比横向的均匀腐蚀速度快。
The corrosion behavior of AM50 bare magnesium alloy and cathodic electrophoresis on naked magnesium alloy and silane pretreatment and cathodic electrophoresis were studied. The corrosion of 3 kinds of samples with Q235 steel in 5% NaCl aqueous solution was studied. The surface corrosion of magnesium alloys with different surface states after soaking at different times was studied. The corrosion rate was measured. The corrosion area was analyzed microscopically and its corrosion behavior was explained by corrosion model. The results show that the corrosion resistance of the magnesium alloy can be obtained by cathodic electrophoresis, and silane pretreatment can further improve the adhesion between the electrophoretic coating and the substrate, thereby greatly improving the galvanic corrosion resistance of the magnesium alloy and the steel bolt. AM50 The area affected by the galvanic corrosion of the Q235 steel bolt does not increase with the increase of the corrosion time, and the galvanic corrosion speed is faster than the horizontal uniform corrosion along the depth direction (contact with the bolt).