Abstract
The effect of molybdate addition to chloride solutions on resistance of AISI 316Ti stainless steel to pitting corrosion was studied. Potentiodynamic polarization tests were performed in 1 M and 0.1 M chloride acidified solutions with various additions of sodium molybdate at room temperature. The presented results compare the effect of molybdate anions on quality of passive film (expressed by the pitting potential) in both chloride solutions. The pitting potential increases with the increase of inhibitor concentration. The inhibitive effect of molybdate ions is stronger in chloride solution of lower aggressiveness (0.1M).
Highlights
Stainless steels are not corrosion resistant in aggressive chloride environments and they are prone to local corrosion, namely pitting [1 - 4]
The authors [5] apply the ratio between concentration of molybdate ions and concentration of chloride ions 1:10 and they document positive effect of the inhibitor on the embryonic stages of pitting corrosion and on the value of the pitting potential as well
The higher inhibitor concentration (0.1 M) caused the extension of the passive region to higher positive potential values and the pitting potential Ep3 is markedly higher than the pitting potential in the absence of molybdate inhibitor Ep1
Summary
Stainless steels are not corrosion resistant in aggressive chloride environments and they are prone to local corrosion, namely pitting [1 - 4]. The authors [5] apply the ratio between concentration of molybdate ions and concentration of chloride ions 1:10 and they document positive effect of the inhibitor on the embryonic stages of pitting corrosion (metastable pitting) and on the value of the pitting potential as well. Other authors [6 - 7, 10 - 12] present the inhibitive effect of various non-aggressive ions added to chloride solutions in a broad interval of concentration ratios (from 1: 250 to 1:1). The presented paper focuses on the effect of molybdate ions on the pitting corrosion resistance of the above mentioned Cr–Ni–Mo stainless steel. 74 ● COMMUNICATIONS 2 A / 2 0 1 7 between molybdate and chloride ions were 1:10 and 1:20 for both chloride solutions
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