The influence of minor alloying elements (Nb, Ti and Cu) on the corrosion resistivity of ferritic stainless steel in sulfuric acid solution

Effects of Copper Addition on the Passivity and Corrosion Behavior of 27Cr-7Ni Hyper Duplex Stainless Steels in Sulfuric Acid Solution

“…In addition, the deposition of CuO, Cu(OH) 2 , CuSO 4 and FeSO 4 reduces the general corrosion rate of the Cu added alloy in the deaerated 2 M H 2 SO 4 solutions at 333 K. (2) In the passive region of 0.6 V SCE , the addition of Cu to the base alloy has a negative effect on the passivation behavior. The Cu addition to the alloy degraded the passivity due to the increase of the formation of the Cr enriched oxide inclusions acting as the defect in the passive film, resulting in the deterioration of the corrosion resistance.…”

“…13) Among the minor alloying elements, Cu is well known alloying element which is used to improve the general corrosion resistance of stainless steel in sulfuric acid solution.…”

“…Seo et al 13) showed that the metallic surface layer of Cu dissolves as cupric ions in the passive potential region which results in a detrimental effect on the stability of the passive film of ferritic stainless steel. Lizlovs 14) found that copper reduces the passive film stability of stainless steels containing 1% Mo, but their the stability was improved by the addition of Cu when the steels contained 3% Mo.…”

Electrochemical and Surface Analytical Approach to Passive Film on 200 Series Stainless Steels Formed in Sulfuric Acid

“…Other researchers have reported a similar feature and linked to oxidation of Cu on the electrode surface. 8,9) The appearance of secondary anodic peak in ferritic stainless steels containing Cu in sulphuric acid has been reported by Seo et al 8) Anodic dissolution of metallic Cu (Cu→ Cu ϩ2 ϩ2e) from stainless steel was attributed to the secondary anodic peak. In another study, Hermas et al 9) have observed the secondary anodic peak in AISI 304 SS containing 0.5 to 2 % Cu.…”

Localized Corrosion Behavior of High Nitrogen-bearing Austenitic Stainless Steels in Seawater Environment

“…Other alloy elements such as copper, [22][23][24] molybdenum 24) and nickel 24) effectively depress the anodic dissolution rate. Differing results have been reported regarding with the effect of nitrogen on anodic peak current, e.g., Vanini et al 25) and Truman 26) showed that the adding nitrogen to stainless steels detrimentally affected active dissolution in an acidic solution.…”