复合粉体对球墨铸铁耐盐雾腐蚀性能的影响

Effect of Composite Powder on Salt Spray Corrosion Resistance of Ductile Iron

研究了在球墨铸铁中添加0.1%复合粉体对其耐盐雾腐蚀性能的影响。结果表明:添加0.10%复合粉体时,石墨球大小分布均匀且圆整度提高,珠光体含量降低;在盐雾试验中形成较为致密的腐蚀产物膜,能够阻碍Cl^-和O以及杂质浸入锈层进一步对金属基体进行腐蚀,增强球墨铸铁在盐雾气氛下的耐蚀性;添加0.1%复合粉体球墨铸铁的自腐蚀电流降低,腐蚀电位由-0.789 V提高到-0.622 V。

The effect of adding 0.1% composite powder on salt spray corrosion resistance of ductile iron was studied. The results showed that when 0.10% composite powder was added into ductile iron, the size and distribution of graphite balls was uniform and the roundness was also improved, while the pearlite content was decreased. A relatively dense corrosion product film on the surface of ductile iron was formed in the salt spray test, which prevented the further corrosion of the metal matrix by Cl^- and O and impurities immersed in the rust layer, and enhanced the corrosion resistance of ductile iron in the salt spray atmosphere. The self-corrosion current of 0.1% composite powder ductile iron decreased, and the corrosion potential increased from-0.789 V to-0.622 V.