H62铜合金镀金接触件镀层破损条件下的腐蚀仿真

目的研究镀层破损条件下的盲孔结构腐蚀。方法利用COMSOL软件实现仿真,通过改变镀层破损区距缝隙口距离(W)和缝隙宽度(H)这两个参数,探讨其对腐蚀的影响。结果腐蚀经过极为短暂的初始阶段即进入稳定阶段,且电流在初始阶段远大于稳定阶段,电解质电位、电极电位在初始及稳定阶段完全不同。阳极反应均发生于破损区域,阴极反应在稳定阶段集中于缝隙口。W、H的增大均会使得电流密度有所增大,但当W大于0.7 mm时,其影响十分微弱,可认为处于稳定值。结论镀层破损条件下的腐蚀为阴极氧化还原反应控制的均匀腐蚀,氧气在初始阶段被快速消耗而得不到补充。W在较小时的改变会对腐蚀有所影响,H的增加会加剧腐蚀。

Corrosion Simulation of Damaged Coating of H62 Copper Alloy Gold-plated Contact

Objective To study the blind via corrosion under the condition of damaged coating. Methods The simulation was carried out with COMSOL software. The influence of the distance between the damage zone (W) and the gap width (H) of the damage zone was discussed. Results The corrosion entered the stable corrosion stage after a very short initial stage, and the current was much longer than the stable stage in the initial stage. The electrolyte potential and the electrode potential were completely different in the initial and stable stages; the anode reaction occurred uniformly in the damaged area; and the cathode reaction focused on the crack mouth in the stable stage; the increase of W and H would increase the current density, but when W was greater than 0.7mm, the effect was very weak and can be considered to be stable. Conclusion The corrosion under the condition of coating damage is the uniform corrosion controlled by the cathode oxygen reduction reaction. The oxygen is quickly consumed in the initial stage and cannot be replenished. The change of W at small time will affect the corrosion. The increase in H will exacerbate corrosion.