Patent
Surface treatment of stainless steel
TLDR
In this paper, a stainless steel having a BA film or a passive state film is immersed in treating liquid of 0.1W50.0% chromic acid, and 0. 1W10.5% MgO or sodium silicate, and then subjected to cathodic treatment at ≤5A/dm 2 current density and 10W90°C liquid temps.Abstract:
PURPOSE: To obtain a stainless steel surface of superior gloss other than corrosion resistance by subjecting a stainless steel with a BA film or a passive state film to cathodic treatment under specific conditions in treating liquid contg. phosphoric acid, chromic acid, and particularly specific concns. of MgO and sodium silicate. CONSTITUTION: A stainless steel having a BA film or a passive state film is immersed in treating liquid of 0.1W50.0% chromic acid, and 0.1W10.0% MgO or sodium silicate or 0.1W2% sum total of both by weight. It is then subjected to cathodic treatment at ≤5A/dm 2 current density and 10W90°C liquid temps. Here, no cathodic treatment effect is obtained unless said film is beforehand formed. If the MgO or sodium silicate or the sum total of both is below the lower limit, there is no effect of annihilating gloss, and if in excess of the upper limit, they separate into a gel form in the case of sodium silicate and provide no gloss in other case. At the current density in excess of the upper limit, no gloss is obtained and this is uneconomical. COPYRIGHT: (C)1982,JPO&Japioread more
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