Chromium plating method for metal label

A signage and metal technology, which is applied in the field of metal signage production, can solve the problems of easy rust and aging, poor effect of chrome plating layer, great influence of chrome plating layer, etc., and achieve strong texture, high anti-corrosion performance, coating adhesion and glossiness Good results

Inactive Publication Date: 2022-04-12
江苏华智公共设施有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for chrome-plating metal signs, comprising the steps of:

[0023] (1) Cleaning oil stains: Use an alkaline solution containing 100g / L sodium hydroxide, 10g / L sodium phosphate, 40g / L calcium carbonate, 15g / L sodium silicate and 5g / L fatty acid glyceride to remove iron The oil stain on the surface of the base metal sign, the temperature of the alkaline solution is 40 ° C, the pH value is 8, the cleaning time is 10 minutes, and then washed with water and dried;

[0024] (2) Removal of oxides: cleaning with an acidic solution containing 45mL / L concentrated phosphoric acid, 30mL / L concentrated nitric acid, 10g / L hydroxylamine sulfate, 5g / L sodium lauryl sulfate and 5g / L sodium nitrite To remove oxides on the surface of the metal signage, the temperature of the acidic solution is 25°C, the pH value is 3, and the cleaning time is 3 minutes, then washed with water and dried;

[0025] (3) Wax removal: Use trichlorethylene solvent to remove wax from the metal plate to b...

Embodiment 2

[0032] A method for chrome-plating metal signs, comprising the steps of:

[0033] (1) Cleaning oil stains: Use an alkaline solution containing 120g / L sodium hydroxide, 25g / L sodium phosphate, 60g / L calcium carbonate, 30g / L sodium silicate and 15g / L fatty acid glyceride to remove iron The oil stain on the surface of the base metal signboard, the temperature of the alkaline solution is 50 ° C, the pH value is 10, the cleaning time is 15 minutes, and then washed with water and dried;

[0034] (2) Removal of oxides: cleaning with an acidic solution containing 60mL / L concentrated phosphoric acid, 60mL / L concentrated nitric acid, 15g / L hydroxylamine sulfate, 10g / L sodium lauryl sulfate and 10g / L sodium nitrite To remove oxides on the surface of the metal signage, the temperature of the acidic solution is 40°C, the pH value is 6, and the cleaning time is 5 minutes, then washed with water and dried;

[0035] (3) Wax removal: Use trichlorethylene solvent to remove wax from the metal p...

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/04C25D5/36C25D7/00C23G1/19C23G1/08
Inventor 王德斌
Owner 江苏华智公共设施有限公司
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