Effect of Cations on the Corrosion of Stainless Alloys in Saline Water at Elevated Temperatures

摘要

The corrosion of stainless steels and copper-nickel alloy in NaCl aqueous solution was studied at 80 exp 0 C and 90 exp 0 C, and at various KCl additions to the NaCl solution. Whereas increasing (Cl exp - ) ions in pure NaCl solutions resulted in higher corrosion rates, KCl additions proved to have some retarding effect to a certain extent. The least corrosive electrolyte was a mixture of NaCl and KCl in a mole ratio of 5 to 4. Anodic polarization was unable to detect this effect. The results have been discussed on the basis of ion-pair formation and supported by conductivity measurements. (Atomindex citation 12:621404)