Eureka AIR delivers breakthrough ideas for toughest innovation challenges, trusted by R&D personnel around the world.

Process for preparing magnesium alloy chemical conversion coating

The invention relates to a technology for a chemical conversion film and a preparation process, which is applied in the field of chromate-free anti-corrosion treatment technology, and can solve the problem that the treatment liquid contains toxic chemical substances, so as to achieve the effects of good corrosion resistance, simple process and operation method, and harm elimination.

Active Publication Date: 2006-12-20
靖江市华信科技创业园有限公司
View PDF0 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main disadvantage of existing conversion coatings is that the treatment fluid contains toxic chemicals
Traditional conversion coating treatment fluids are based on various compounds of chromium, which is highly carcinogenic

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 Construction

[0039] The steps of the magnesium alloy chemical conversion film preparation process of the present invention include: degreasing, water washing, pickling, water washing, activation, water washing, chemical formation, sealing and drying, and the specific steps are as follows:

[0040] a, degreasing: be 1% by weight percentage, the sodium hydroxide that concentration is 15g / L, 3% by weight percentage, the sodium phosphate that concentration is 40g / L, 1.5% by weight percentage, the sodium carbonate that concentration is 15g / L and sodium silicate with a weight percentage of 1.5% and a concentration of 15 g / L to form a mixed solution, and degrease the magnesium or magnesium alloy at a temperature of 65° C. for 3 minutes. After degreasing, it can be washed with deionized water several times to clean the degreasing liquid remaining on the magnesium or magnesium alloy workpiece.

[0041] b. Pickling: use 2% by weight, phosphoric acid with a concentration of 20ml / L and 1% by weight, s...

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

PropertyMeasurementUnit
densityaaaaaaaaaa
Login to View More

Abstract

The invention discloses a chemical transmission film preparing technology of magnesium alloy, which comprises the following steps: a. proceeding degreasing disposal for magnesium or magnesium alloy through sodium hydroxide or one or multiple hybrid solutions of sodium phosphate with sodium hydroxide, sodium carbonate and sodium silicate solution; b. proceeding acid cleaning disposal for degreased magnesium or magnesium alloy through hybrid solution of phosphoric acid and sodium phosphate; c. proceeding activating disposal for acid cleaned magnesium or magnesium alloy through hybrid solution of fluohydric acid and sodium phosphate; d proceeding chemical synthesizing disposal for activated magnesium or magnesium alloy through composite solution of calcium nitrate hydrate, sodium nitrite, sodium iodide and hydrogen dioxide solution; e. packing hole of synthetic magnesium or magnesium alloy through deionized water. The invention doesn't utilize chromic composition, which eliminates danger for environment.

Description

technical field [0001] The invention relates to a metal surface treatment process, in particular to a chromate-free anti-corrosion treatment process for magnesium and magnesium alloys. Background technique [0002] Magnesium alloy is currently the lightest metal engineering material. Its density is 1.74g / cm3, which is only 2 / 3 of aluminum and 1 / 4 of iron. At the same time, it has the characteristics of high specific strength and good processing performance. , aerospace, electronic IT, and military products have broad application prospects, and are known as "green engineering materials in the 21st century". However, magnesium has active chemical properties, low stability, negative standard electrode potential (-2.36eV), and extremely poor corrosion resistance. It will also oxidize in the air even at room temperature, and the surface oxide film is loose and alkaline. Its pH value is about 10.5, which is not conducive to painting. Therefore, poor corrosion resistance has beco...

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 Applications(China)
IPC IPC(8): C23C22/05C23C22/78
Inventor 肖美群
Owner 靖江市华信科技创业园有限公司
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
Eureka Blog
Learn More
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com