STAINLESS STEEL WITH HIGH ANTIRUST PROPERTIES FOR FUEL CELL AND METHOD OF ITS PRODUCTION Russian patent published in 2014 - IPC C25D11/34 C22C38/28 C22C38/26 C22C38/18 

FIELD: metallurgy.

SUBSTANCE: invention relates to metallurgy, particularly, to production of stainless steel sheet for fuel element separator. Sheet is made of steel containing in wt %: C: 0.05-0.20%, Si: 0.10% or less, Mn: 0.2-1.7%, P: 0.10% or less, S: 0.10% or less, Al: 0.01-0.10%, N: 0.010%, Fe and arbitrarily impurities making the rest. Si: 1.0 or less, Mn: 1.0 or less, S: 0.01 or less, P: 0.05 or, Al: 0.20 or less, N: 0.03 or less, Cr: 20-40, at least one of metals selected from the group including Nb, Ti and Zr, on the whole: 1.0 or less, Fe unavoidable impurities making the rest. Coating is applied on sheet surface and that features the relationship of definite methods of X-ray photo electronic spectroscopy intensities [(OO/OH)/(Cr/Fe)], equal to 1.0 or larger. Said coating is formed by anodic polarisation of stainless steel surface in electrolyte solution with sodium sulphate concentration of 0.1-0.3 mol/l and pH of 7 or less at potential of 0.5 V or higher relative to standard hydrogen electrode for 10 seconds or more.

EFFECT: higher corrosion resistance.

15 cl, 1 dwg, 7 tbl, 5 ex