Chromium plating method for metal label

Abstract

The invention discloses a metal label chromium plating method which comprises the following steps: (1) cleaning greasy dirt: cleaning and removing the greasy dirt on the surface of an iron-based metal label by adopting an alkaline solution, (2) removing oxides: cleaning and removing the oxides on the surface of the metal label by adopting an acid solution, (3) removing wax, (4) carrying out ultrasonic cleaning, and (5) plating chromium. The treated metal label is placed in an electroplating bath containing a chromium plating solution for electroplating, the chromium plating solution comprises chromic anhydride, trivalent chromium, sulfuric acid and an additive, the concentration of the chromic anhydride is 290 g / L, the concentration of the trivalent chromium is 3 g / L, the weight ratio of the chromic anhydride to the sulfuric acid is 100: 1.15, and the concentration of the additive is 6 g / L; a chromium plating layer on the surface of the prepared metal label is uniform and attractive, and the metal label has high anti-corrosion performance. The chromium-plated layer of the metal label is very strong in surface effect and texture, and the plating layer is good in adhesive force and glossiness.

Description

technical field [0001] The invention relates to the technical field of making metal signs, in particular to a chrome-plating method for metal signs. Background technique [0002] In the process of processing metal signs, electroplating treatment is required before the finished product. Without electroplating, it is easy to rust and age, and the gloss is not high, and it is not beautiful. The quality of chrome plating depends largely on the pretreatment process in the early stage and the choice of chrome plating solution in the later stage, especially in the pretreatment process of cleaning oil, removing oxides and waxes. If the treatment is not in place, it will damage the chrome plating layer. Influence is very big, and prior art pretreatment step is incomplete or not in place, causes the effect of late chrome plating layer to be poor, not attractive in appearance, and glossiness is not high. Contents of the invention [0003] In view of the deficiencies in the prior art...

AI Technical Summary

Problems solved by technology

[0002] In the process of metal signage processing, electroplating treatment is required before the finished product. If it is not electroplated, it is easy to rust and age, the gloss is not high, and it is not beautiful

The quality of chrome plating depends largely on the pretreatment process in the early stage and the choice of chrome plating solution in the later stage, especially in the pretreatment process of cleaning oil, removing oxides and waxes. If the treatment is not in place, it will damage the chrome plating layer. The impact is great. The pretreatment steps of the existing technology are incomplete or not in place, resulting in poor effect of the chrome plating layer in the later stage, unsightly, and low gloss