TY - GEN
T1 - Electrochemical behaviour of 2101, 2101 with ruthenium and 316 SS
AU - Olaseinde, O. A.
AU - Van Der Merwe, J. W.
AU - Cornish, L. A.
AU - Olubambi, P. A.
PY - 2011
Y1 - 2011
N2 - Corrosion resistance of stainless steel has been improved by minor additions of platinum group metals. It also improved the ability of the alloy to passivate. It has been shown that 2101 duplex stainless steel has better corrosion resistance than 304 austenitic stainless steel, but less than 316 austenitic stainless steels. Calculations of the alloy using Thermo-Calc showed that minor additions of ruthenium to 2101 duplex stainless steel did not change its dual phase structure and the ruthenium partitioned equally to both phases. The alloy was produced with a nominal composition of 0.15wt% Ru and it was then solution annealed at 1080°C for 90 minutes. The morphology of the alloys was studied using an optical microscope. The electrochemical behaviour of 2101, 2101-Ru duplex stainless steel as well as 316 austenitic stainless steels was studied in sulphuric acid and sulphuric acid with chloride at 25°C. The corrosion rates were calculated and it was shown that minor ruthenium additions improved the corrosion resistance of 2101 duplex stainless steel and it performed better than the 316 austenitic stainless steel in both media. With ruthenium, the passive region increased and a lower passive current density of 2.8×10 -5 A/cm 2 was obtained, compare to 1.0×10 -4A/cm 2 without ruthenium.
AB - Corrosion resistance of stainless steel has been improved by minor additions of platinum group metals. It also improved the ability of the alloy to passivate. It has been shown that 2101 duplex stainless steel has better corrosion resistance than 304 austenitic stainless steel, but less than 316 austenitic stainless steels. Calculations of the alloy using Thermo-Calc showed that minor additions of ruthenium to 2101 duplex stainless steel did not change its dual phase structure and the ruthenium partitioned equally to both phases. The alloy was produced with a nominal composition of 0.15wt% Ru and it was then solution annealed at 1080°C for 90 minutes. The morphology of the alloys was studied using an optical microscope. The electrochemical behaviour of 2101, 2101-Ru duplex stainless steel as well as 316 austenitic stainless steels was studied in sulphuric acid and sulphuric acid with chloride at 25°C. The corrosion rates were calculated and it was shown that minor ruthenium additions improved the corrosion resistance of 2101 duplex stainless steel and it performed better than the 316 austenitic stainless steel in both media. With ruthenium, the passive region increased and a lower passive current density of 2.8×10 -5 A/cm 2 was obtained, compare to 1.0×10 -4A/cm 2 without ruthenium.
KW - Duplex stainless steel
KW - Ruthenium
UR - http://www.scopus.com/inward/record.url?scp=84867239225&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:84867239225
SN - 9781618393630
T3 - 18th International Corrosion Congress 2011
SP - 1541
EP - 1548
BT - 18th International Corrosion Congress 2011
T2 - 18th International Corrosion Congress 2011
Y2 - 20 November 2011 through 24 November 2011
ER -