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Chromium plating method of automobile stainless steel tail gas decorating part

A technology for automobile exhaust and decorative parts, which is applied in the field of chrome plating of automobile stainless steel exhaust decorative parts, can solve the problems that the performance of the coating layer cannot meet the use requirements, the pretreatment work is not in place, and the chrome layer has a great influence, etc., and achieves excellent comprehensive performance. Save space and equipment, improve the effect of smoothness

Inactive Publication Date: 2016-11-16
LIUZHOU JINYUAN MACHINERY MFG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The chrome plating process has a lot to do with the strength and corrosion resistance of the metal coating, especially the pretreatment process of chrome plating has a great influence on the chromium layer. Many chrome plating failures are due to inadequate pretreatment work, such as degreasing, wax removal, Problems such as degreasing and insufficient activation lead to low quality during chrome plating, and the performance of the coating cannot meet the requirements for use; the composition of the electroplating solution, electroplating time, and current density also have a great relationship with the electroplating quality. treatment, the chrome plating process must also strictly control the technical parameters

Method used

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  • Chromium plating method of automobile stainless steel tail gas decorating part

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Comparison scheme
Effect test

Embodiment 1

[0024] The chrome-plating method of automobile stainless steel tail gas trim of the present invention comprises the following steps:

[0025] (1) Chemical degreasing: Soak automotive stainless steel exhaust trim in chemical degreasing agent, keep the temperature at 70°C, and treat for 2 minutes, then take it out and rinse it with hot water at 50°C;

[0026] (2) Anode electrochemical degreasing: use alkaline solution as the electrolyte, use the decorative parts after chemical degreasing as the anode, and perform electrochemical degreasing treatment with a current density of 0.3A / dm 2 , the operating temperature is 65°C, and the degreasing time is 5 minutes. After the treatment, clean it with hot water at 50°C;

[0027] (3) Pickling activation: immerse the decorative parts after anodic electrochemical degreasing in a strong acid solution for 30 seconds, then clean the decorative parts that have completed the acid activation, and dry them for use;

[0028] (4) Electroplating: Ad...

Embodiment 2

[0035] The chrome-plating method of automobile stainless steel tail gas trim of the present invention comprises the following steps:

[0036] (1) Chemical degreasing: Soak the automotive stainless steel exhaust trim in chemical degreasing agent, keep the temperature at 75°C, and treat for 3 minutes, then take it out and rinse it with hot water at 59°C;

[0037] (2) Anode electrochemical degreasing: use alkaline solution as the electrolyte, use the decorative parts after chemical degreasing as the anode, and perform electrochemical degreasing treatment with a current density of 0.4A / dm 2 , the operating temperature is 73°C, and the degreasing time is 6 minutes. After the treatment, clean it with hot water at 60°C;

[0038] (3) Pickling activation: immerse the decorative parts after anodic electrochemical degreasing in a strong acid solution for activation for 40 seconds, then clean the decorative parts that have completed the acid activation, and dry them for use;

[0039] (4)...

Embodiment 3

[0046] The chrome-plating method of automobile stainless steel tail gas trim of the present invention comprises the following steps:

[0047] (1) Chemical degreasing: Soak the automotive stainless steel exhaust trim in chemical degreasing agent, keep the temperature at 78°C, and treat for 4 minutes, then take it out and rinse it with hot water at 63°C;

[0048] (2) Anode electrochemical degreasing: use alkaline solution as the electrolyte, use the decorative parts after chemical degreasing as the anode, and perform electrochemical degreasing treatment with a current density of 0.5A / dm 2 , the operating temperature is 77°C, and the degreasing time is 7 minutes. After the treatment, clean it with hot water at 65°C;

[0049](3) Pickling activation: immerse the decorative parts after anodic electrochemical degreasing in a strong acid solution for 50 seconds, then clean the decorative parts that have completed the acid activation, and dry them for use;

[0050] (4) Electroplating:...

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Abstract

The invention discloses a chromium plating method of an automobile stainless steel tail gas decorating part. The chromium plating method includes the following steps that a chemical oil removal agent is used for removing oil for the automobile stainless steel tail gas decorating part; electrochemistry oil removal is carried out; the automobile stainless steel tail gas decorating part is immersed into strong acid liquid to be activated after cleaning is finished; and the automobile stainless steel tail gas decorating part is placed into a plating bath to be electroplated with current which is 1.5 times to 2 times of normal electroplating current in density for 3 minutes to 5 minutes and then electroplated with the normal electroplating current, and the automobile stainless steel tail gas decorating part is obtained. A plating layer obtained through the chromium plating method is even and smooth in surface, the structure of the plating layer is compact, the degree of finish of the surface of the decorating part is improved, and the appearance of the decorating part is more bright and clean; in addition, the properties including the hardness, the anti-corrosion property, the abrasive resistance, the bonding force, the corrosion resistance, the electrochemistry performance and the like of the plating layer are excellent; and compared with a plating layer obtained through a conventional method, the plating layer obtained through the method has the excellent comprehensive performance, can be suitable for various using environments, has remarkable advantages when being used under the hostile environment and has a wide application prospect.

Description

technical field [0001] The invention relates to the technical field of electroplating, in particular to a chrome-plating method for automobile stainless steel exhaust decoration parts. Background technique [0002] Chromium is a silvery-white metal with a slight bluish tint, its relative atomic mass is 51.99, its density is 6.98-7.21g / cm3, and its melting point is 1875-1920°C. Metal chromium is easily passivated in the air, forming an extremely thin layer on the surface. Passivation film, thus showing the properties of noble metals. [0003] The chromium plating layer has a high hardness, and its hardness can vary within a wide range of 400-1200HV according to the composition of the plating solution and the process conditions. The chrome-plated layer has good heat resistance. When heated below 500°C, its gloss and hardness will not change significantly. When the temperature is higher than 500°C, it will start to oxidize and change color, and the hardness will begin to decre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/08C25D5/36C25F1/06C23G5/06C23G5/036
CPCC23G5/036C23G5/06C25D3/08C25D5/36C25F1/06
Inventor 谭高询邓加尊李泽状
Owner LIUZHOU JINYUAN MACHINERY MFG
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