What is it about?
Ni-Cr-Fe alloys used as steam generator tubing materials may suffer two different pitting corrosion processes depending on the potential range and the thiosulfate and chloride concentrations. High-potential and low-potential pitting corrosion processes are identified. They have different features: low potential pits are round and grow slowly while high potential pits have a lacy cover and grow quickly.
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Why is it important?
For the first time, two different a pitting corrosion processes are identified for alloy 690 and 800, which are the current choices of tubing materials for nuclear steam generators.
Read the Original
This page is a summary of: Effect of thiosulfate on pitting corrosion of Ni-Cr-Fe alloys in chloride solutions, CORROSION, August 2018, NACE International, DOI: 10.5006/2923.
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