Abstract
Electrochemical descaling of annealed stainless steel using electrolytes consisting of H2SO4, Na2SO4 and NaNo3 was studied as a function of the ratio of the constituents. Clear multiple power correlations were found between the amounts of the scaled or polished steel dissolved and the molar fractions of the constituents. The contour bands of the dissolution amount were illustrated on tripolar coordinate diagrams for the H2SO4-NaSo4-NaNo3 system. By adjusting the composition of the electrolyte, ca. 0.1μm thick scaled 13-Cr stainless steel was electrochemically descaled under conditions of 25-35Adm-2 in 5-10sec.
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