Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of surface treatment method of magnesium alloy die casting

A surface treatment and surface pretreatment technology, applied in metal material coating process, liquid chemical plating, coating, etc., can solve problems affecting application, uneven film, uneven surface, etc., to achieve strong repeatability, Simple operation effect

Active Publication Date: 2018-01-12
泰州市金鹰精密铸造有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the wet surface treatment method forms an uneven film on the surface of magnesium alloy castings, and the surface is not smooth, which makes it difficult for the next step of nickel plating and other operations, affecting the application.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Polish the surface of the magnesium alloy die casting with 800 mesh sandpaper to remove the burrs on it. Then soak it in a sodium hydroxide solution with a mass fraction of 10% for 15 minutes; take out the casting from the sodium hydroxide solution, place it in a hydrofluoric acid solution with a volume fraction of 15%, and soak it for 15 minutes at 50°C , take it out after soaking, and rinse its surface with water; then place the casting in sodium dichromate solution for 20 minutes at room temperature, take it out after soaking, and rinse its surface with water again, wherein the composition of sodium dichromate solution is Sodium dichromate 80g / L, magnesium sulfate 56g / L, manganese sulfate 45g / L, adjust the pH to 2.5 with chromic anhydride.

Embodiment 2

[0025] Polish the surface of the magnesium alloy die casting with 800 mesh sandpaper to remove the burrs on it. Then put it in a sodium hydroxide solution with a mass fraction of 20% for 20 minutes; take out the casting from the sodium hydroxide solution, place it in a hydrofluoric acid solution with a volume fraction of 20%, and soak it for 20 minutes at 60°C , take it out after soaking, and rinse its surface with water; then place the casting in sodium dichromate solution for 30 minutes at room temperature, take it out after soaking, and rinse its surface with water again, wherein the composition of sodium dichromate solution is Sodium dichromate 80g / L, magnesium sulfate 56g / L, manganese sulfate 45g / L, adjust the pH to 3 with chromic anhydride.

[0026] In the above embodiments, soaking in sodium dichromate solution is carried out at room temperature, which can avoid environmental pollution caused by solution volatilization. At the same time, mild conditions also make the fi...

Embodiment 3

[0028] The treated magnesium alloy castings obtained in Examples 1 and 2 were nickel-plated with a nickel sulfate solution. The composition of nickel sulfate solution is: nickel sulfate 40g / L, sodium citrate 40g / L, lactic acid 30g / L, acetic acid 30g / L, thiourea 5mg / L, sodium hypophosphite 60g / L, pH is 4. During the nickel plating process, the temperature is controlled at 65°C, and the nickel plating time is 2~3h.

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

The invention discloses a surface treatment method for magnesium alloy die castings, which mainly includes: surface pretreatment of magnesium alloy die castings, degreasing and degreasing, hydrofluoric acid solution treatment, sodium dichromate solution treatment, nickel plating and other steps, belonging to metal Casting surface treatment technology field. The present invention improves the adhesion of the film layer by treating the surface of the magnesium alloy die casting twice, and at the same time, when using sodium dichromate solution to treat the casting, the conditions are relatively mild, so that the surface of the magnesium alloy die casting is also relatively soft. Smooth and flat, more suitable for industrial applications.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of metal castings, and in particular relates to a surface treatment method of magnesium alloy die castings. Background technique [0002] Magnesium alloy has the characteristics of light weight and recyclability. It is widely used in electronic equipment, automobiles and other fields, and has gradually become an ideal material for modern industrial products. With the continuous expansion of the scope of application of magnesium alloys and the rapid increase in the amount of use, the magnesium industry is growing at a high-speed geometric progression. However, since magnesium is an active metal, its surface is easy to oxidize and has poor corrosion resistance, so magnesium alloy die castings must be properly surface treated according to specific requirements before use. In the production cost of magnesium alloy die castings, surface treatment accounts for about 40%, so surface treatment ...

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): C23C18/18C23C18/32
Inventor 朱兴阳刘杰朱玉棠
Owner 泰州市金鹰精密铸造有限公司
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

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

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com