材料期刊网

    采用户外大气暴露和人工模拟溶液的方法.研究了Sn-9Zn合金在大气环境和腐蚀性溶液中的腐蚀行为.结果表明，在户外大气暴露12天，合金表面已发生明显的腐蚀；腐蚀产物的微观形貌主要有刺球状和针状两种；除Zn与Sn以外，腐蚀产物中还含有大量的O，分析认为可能是一种Sn-Zn的氢氧化物；在实验条件范围内，合金在腐蚀溶液中腐蚀速度相对较快，在15天内平均腐蚀质量损失达到0.20 mg/dm²～0.25 mg/dm²,表面腐蚀速度与腐蚀溶液中盐的浓度关系不大.

    Sn-9Zn alloy is a low cost eutectic Pb-free solder.Since Zn exists in the alloy,the corrosion resistance is poor.Present work was focused on the corrosion behavior of Sn-9Zn in both outdoor atmosphere and an artificial simulated solution.The corrosion product was observed by SEM and analyzed by EDAX.The results showed that in the case of atmosphere corrosion,the surface of the alloy suffered from obvious corrosion after expoure for 12 days only.The morphology of the corrosion product mainly presents as thorn spheres and needles.Except Sn and Zn,there was a lot of oxygen in the corrosion product. Zn(OH)₂ as one of the corrosion product was assumed in the discussion. Moreover,the corrosion rate was relatively fast in the artificial solution,the average corrosion rate of the alloy was up to 0.20～0.25 mg/dm² within 15 days.In this experiment,the corrosion rate of the alloy was little influenced by the concentration of the corrosive salt in the solution.