The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an energy enhanced process to deposit a silicate containing coating or film upon a metallic or conductive surface.

An energy enhanced process for treating a conductive surface and products formed thereby

The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an electrolytic process to deposit a mineral containing coating or film upon a metallic or conductive surface.

Electrolytic process for forming a mineral

The disclosure relates to a process for forming a deposit on the surface of a metallic or conductive surface. The process employs an electrolytic process to deposit a silicate containing coating or film upon a metallic or conductive surface.

Electrolytic process for treating a conductive surface and products formed thereby

A method and a treatment solution for post-treatment of an article with a metallic surface, where the metallic surface is made of one or more metals of a standard oxidation potential within the range -2.5 to +0.5 V. A thin coating is formed on the metallic surface by a treatment with an aqueous solution containing a molybdenum compound selected among molybdic acid and salts thereof in a concentration of 2.9 to 9.8 g/l calculated as molybdenum, as well as a compound capable of forming a heteropolymolybdate, such as phosphoric acid, together with a molybdate. The treatment is performed under conditions where the metal surface is maintained at a potential within the range of -600 and -1800 mV/nhe. A corrosion-protecting and/or decorative effect is obtained which can be compared with the effect obtained by conventional chromate treatment, and which avoids the environmental and toxicologic drawbacks associated with the chromate treatment.

A method for post-treatment of an article with a metallic surface as well as a treatment solution to be used in the method

Zinciferous and/or aluminiferous metal surfaces can be passivated by treatment with a chromium-free aqueous solution of phosphoric acid and molybdenum that is at least partially in a valence state lower than +6, to produce, especially with an acrylic overcoating, a surface as resistant to corrosion as the surface of the same substrate after passivation with conventional liquid compositions that contain hexavalent chromium.

Passivation composition and process for zinciferous and aluminiferous surfaces

A process for surface treatment of stainless steel sheets for excellent corrosion resistance and gloss is provided according to which a BA film or a passive film is formed on the stainless steel sheet; the sheet is dipped in a treatment solution containing 0.1 to 50% by weight of phosphoric acid, 0.1 to 10.0% by weight of a molybdate, chromic acid or a mixture thereof, and 0.1 to 2.0% by weight of magnesium oxide, sodium silicate or a mixture thereof; and cathodic treatment is carried out under the conditions of 1 to 600 A.sec/dm2 integrated electric current density and 0° to 90° C. solution temperature.

Process for surface treatment of stainless steel sheet

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&Japio

Kazuaki Hatakeyama

Papers

Process for surface treatment of stainless steel sheet

Surface treatment of stainless steel