本文研究硫代硫酸根离子对镍基６９０合金在氯化钠水溶液中之孔蚀行为．发现在单纯硫代硫酸钠水溶液中，镍基６９０合金不发生孔蚀．在氯化钠水溶液中，当添加的硫代硫酸根离子浓度低时，会增进孔蚀的敏感性；当硫代硫酸根离子浓度高时，则反而抑制孔蚀．
The effect of thiosulfate ion on the pitting corrosion behavior of Ni_Based Alloy 690 in chloride solution was investigated.In plain sodium thiosulfate solution,Alloy 690 was immune to pitting corrosion. However, the addition of low concentration of sodium thiosulfate can enhance the initiation of pitting corrosion of Alloy 690. Nevertheless, inhibition of pitting corrosion was observed at high concentration of addition.
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