A method for electrolytic deplating of zinc layer and chromium passivation layer on the surface of iron parts

A technology of chromium passivation and iron parts, applied in the field of metal surface treatment and electrolytic stripping, can solve the problems of increasing the risk of hydrogen embrittlement, affecting the production environment, workpiece bubbling, etc., achieving high removal efficiency and reducing the effect of process flow

Active Publication Date: 2018-06-19
江门市鼎翔电子科技有限公司
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the unqualified galvanized layer on iron parts usually needs to be removed by soaking in hydrochloric acid. During the removal process, the workpiece will bubble violently, causing acid mist to escape and affecting the production environment; in addition, if the iron parts are soaked for a long time, the hydrogen Embrittlement-sensitive workpieces increase the risk of hydrogen embrittlement

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method for electrolytic deplating of zinc layer and chromium passivation layer on the surface of iron parts
  • A method for electrolytic deplating of zinc layer and chromium passivation layer on the surface of iron parts
  • A method for electrolytic deplating of zinc layer and chromium passivation layer on the surface of iron parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for electrolytic deplating of a zinc layer and a chromium passivation layer on the surface of an iron piece, comprising the following steps:

[0027] 1) Put the iron piece to be deplated into the deplating solution and connect it to the positive pole of the rectifier as the anode, put the stainless steel plate into the deplating solution and connect the negative pole of the rectifier as the cathode to form an electrolytic deplating system. The distance between the plated iron piece and the stainless steel plate in the deplating solution is 5cm;

[0028] 2) Turn on the rectifier, output 3V DC voltage to the electrolytic deplating system, start electrolytic deplating, the zinc layer and chromium passivation layer on the surface of the iron parts begin to dissolve, the zinc layer on the surface of the stainless steel plate continues to deposit, and the current of the electrolytic deplating system continues to drop ; The initial anode current density of the electro...

Embodiment 2

[0034] A method for electrolytic deplating of a zinc layer and a chromium passivation layer on the surface of an iron piece, comprising the following steps:

[0035] 1) Put the iron piece to be deplated into the deplating solution and connect it to the positive pole of the rectifier as the anode, put the stainless steel plate into the deplating solution and connect the negative pole of the rectifier as the cathode to form an electrolytic deplating system. The distance between the plated iron piece and the stainless steel plate in the deplating solution is 8cm;

[0036] 2) Turn on the rectifier, output 6V DC voltage to the electrolytic deplating system, start electrolytic deplating, the zinc layer and chromium passivation layer on the surface of the iron parts begin to dissolve, the zinc layer on the surface of the stainless steel plate continues to deposit, and the current of the electrolytic deplating system continues to drop ; The initial anode current density of the electro...

Embodiment 3

[0043] A method for electrolytic deplating of a zinc layer and a chromium passivation layer on the surface of an iron piece, comprising the following steps:

[0044] 1) Put the iron piece to be deplated into the deplating solution and connect it to the positive pole of the rectifier as the anode, put the stainless steel plate into the deplating solution and connect the negative pole of the rectifier as the cathode to form an electrolytic deplating system. The distance between the plated iron piece and the stainless steel plate in the deplating solution is 15cm;

[0045] 2) Turn on the rectifier, output 7V DC voltage to the electrolytic deplating system, start electrolytic deplating, the zinc layer and chromium passivation layer on the surface of iron parts begin to dissolve, the zinc layer or chromium layer on the surface of the stainless steel plate is continuously deposited, the electrolytic deplating system The current keeps decreasing; the initial anodic current density of...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

Disclosed in the present invention is a method for electrolytically deplating a zinc layer and a chromium passivation layer on the surface of an iron piece, comprising the steps of: connecting an iron piece to be deplated to the positive electrode of a rectifier to be used as the anode; placing a stainless steel plate in a deplating solution and connecting same to the negative electrode of the rectifier to be used as the cathode; and dissolving the zinc layer or chromium passivation layer on the surface of the iron piece by means of electrolytic deplating so as to deposit zinc powder on the surface of the stainless steel plate. The method for electrolytically deplating a zinc layer and a chromium passivation layer on the surface of an iron piece of the present invention can completely remove the unqualified zinc layer or chromium passivation layer on a workpiece, providing a high removing efficiency; and said method does not produce acid fog, being environmentally friendly. The deplating does not cause over-corrosion on workpieces and does not produce hydrogen embrittlement. Zinc powders or a chromium layer deposited on the cathode can be directly recovered. Removal of an unqualified zinc layer and a chromium passivation layer on a workpiece and zinc powder deposition on the cathode are performed simultaneously, simplifying the process.

Description

technical field [0001] The invention belongs to the field of metal surface treatment and electrolytic deplating, and in particular relates to a method for electrolytic deplating of a zinc layer and a chromium passivation layer on the surface of an iron piece. Background technique [0002] During the processing of metal workpieces, various functional films are often formed on the metal surface. During the formation of the film layer, some defective products will be produced on the surface of the workpiece due to various reasons, such as unqualified zinc layer or chromium passivation layer. At present, the unqualified galvanized layer on iron parts usually needs to be removed by soaking in hydrochloric acid. During the removal process, the workpiece will bubble violently, causing acid mist to escape and affecting the production environment; in addition, if the iron parts are soaked for a long time, the hydrogen Embrittlement-sensitive workpieces increase the risk of hydrogen ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): C25F5/00
CPCC25F5/00
Inventor 韩永祥韩宏亮
Owner 江门市鼎翔电子科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap