Colouring solution used for stainless steel electrochemical colouring and stainless steel electrochemical colouring method

Abstract

The invention relates to a stainless steel surface treatment reagent, in particular to a stainless steel surface colouring method. According to the invention, with water as a solvent, each litre of solution contains 30-80g of molybdate, 10-18g of boric acid, 2-5g of zinc sulphate, 0.5-5g of manganese sulphate, 2-15g of antimony nitrite, 0.2-2g of lanthanum nitrite and 0.1-10g of sodium malonate. The stainless steel surface colouring method comprises the following basic flow: oil removing, electrolytic polishing, cleaning, colouring, cleaning and drying and obtaining the finished product, wherein an anode is a workpiece to be coloured, a cathode is a lead plate, a colouring current is controlled to be 0.1-5A / dm<2>, voltage is 1.5-2.5V, a colouring temperature is room temperature, colouring time is 0.1-30 minutes, cleaning and drying are carried out after colouring, and the surface of the obtained sample is uniform and bright. The stainless steel electrochemical colouring process provided by the invention needs simple equipment, is easy to operate, contains no toxic substance and is beneficial to environmental protection; and colouring is stable, and a high-quality colour stainless steel product can be produced by adopting the stainless steel electrochemical colouring process.

Description

technical field [0001] The invention relates to a stainless steel surface treatment reagent, in particular to a coloring method for the stainless steel surface. Background technique [0002] Stainless steel has excellent corrosion resistance and wear resistance. With the improvement of people's living standards, stainless steel products continue to develop into decorative aspects, so the color requirements for stainless steel surfaces are also increasing. [0003] Coloring stainless steel is to form color on the surface of stainless steel, thus becoming colored stainless steel. The industrial production of colored stainless steel originated from the British INC0 company in 1973. The INCO method is to immerse the stainless steel workpiece in a mixed solution containing high concentrations of chromic acid and sulfuric acid at 80 ° C. By controlling the length of immersion, translucent surfaces of different thicknesses are formed on the surface chromium oxide film. Due to th...

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Problems solved by technology

[0013] The coloring temperature of this coloring liquid is 80-140 °C, the temperature is relatively high, it needs to be heated, and the temperature has a great influence on the color of the coloring layer. Oxidation corrosion, resulting in rough surface and poor gloss

In addition, a large amount of sulfuric acid is required in the coloring liquid, and the coloring cost is relatively high. The presence of sulfuric acid also makes it difficult to dispose of the coloring waste liquid.

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