Method for plating chrome on surface of thin plate

Abstract

The invention discloses a method for plating chrome on a surface of a thin plate. The method comprises the following steps: 1) alkali washing, including alkali liquor leaching, electrolysis washing and alkali washing; 2) pickling, including electrolysis pickling and acid washing; 3) electroplating, including chromeplating and washing; and 4) oiling. The method sufficiently utilizes the performance advantage of CrO3+NH4 plating solution, optimizes the pre-treatment pickling process and electroplating parameters, particularly controls the solution concentration of alkali washing and pickling, strictly controls the current efficiency of an electroplating section and the electroplating concentration, overcomes the defects in the tradition process, generates compact metal chrome and chromic oxide layers on the surface of strip steel, realizes one-step production of an electrolytic chromium steel plate the strip steel surface of which is plated with optimally combined metal chromium and chromic oxide so as to obtain the excellent chromeplated plate with bright and uniform plating layer. Meanwhile, the method saves energy consumption, reduces pressure environment-friendly emission, reduces cost for production and maintenance, and creates a condition for improving the chromeplated plate, thus having excellent popularization and application prospect.

Description

technical field [0001] The invention relates to a treatment method for chrome plating on the surface of a steel plate, in particular to a method for chrome plating on the surface of a thin plate. Background technique [0002] For more than 100 years, tin-plated steel has been the main packaging material such as can container materials and shells. The current annual output of the world is about 20 million tons. Tin-free steel plate" instead of tin plate. [0003] At the beginning of research on other surface-treated thin steel plates, most of them were "conversion coatings", that is, to produce chemical conversion layers on the iron surface in aqueous solution, and trial-produced chromic-acid-treated steel plates and electrolytic phosphate-treated steel plates. Nickel steel plate, vacuum aluminum plated steel plate, etc. Compared with electroplated tin plate, these materials have insufficient corrosion resistance, the process time is much longer than tin plating time, and th...

AI Technical Summary

Problems solved by technology

[0009] Although the two-step method can control the amount of metal chromium and chromium oxide more accurately, it will not affect the corrosion resistance of the chrome-plated plate after processing and deformation due to too much metal chromium, or too much chromium oxide will darken the surface color and affect the Appearance; but the investment and production costs are relatively high, and the pressure on environmental protection and emissions is relatively high

Images