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Composite treatment method for magnesium alloy surface

A technology of surface compounding and treatment method, applied in the direction of surface reaction electrolytic coating, anodizing, electrolytic coating, etc., can solve the problems of limited, thin film, crack protection ability, etc., to reduce the production cost and enhance the comprehensive performance of the coating , the effect of increasing the density

Inactive Publication Date: 2015-10-28
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, chemical conversion still has major problems such as thin film layer and many microscopic defects such as pores / cracks, so the protection ability is extremely limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Use distilled water as solvent according to formula 4.2g / LKH 2 PO 4 +6.0936g / LCa(NO 3 ) 2 ·6H 2 O preparation of electrolyte. Control the temperature of the solution at 37+1°C, and immerse the sample in the solution for chemical conversion treatment for 50 minutes. Immediately after that, turn on the DC power supply, use flake graphite as the anode (counter electrode), and use a constant current of 0.7mA / cm 2 The samples were subjected to cathodic deposition treatment for 30 min. Then cut off the power, wash the sample with water and dry it with hot air. The result is a uniform, dense coating in appearance. EDS and XRD test results show that the main element composition of the cathode deposition layer is O, Ca and P, and the main phase composition is DCPD (CaHPO 4 2H 2 o). The corrosion resistance test was carried out according to the decolorization method in ZL 200810028153.1, and the results showed that the corrosion resistance of the composite treated sampl...

Embodiment 2

[0032] In addition to the electrolyte formula changed to 5.4g / LKH 2 PO 4 +9.5489g / LCa(NO 3 ) 2 ·6H 2 Except 0, other conditions of sample preparation are the same as embodiment 1. The result is a uniform, dense coating in appearance. Carry out coating corrosion resistance and adhesion test according to embodiment 1, the result shows: the corrosion resistance of composite treatment sample improves 42.84% compared with the direct cathodic deposition sample in the same electrolyte; Adhesion rating is the same as embodiment 1.

Embodiment 3

[0034] In addition to electrolyte formula changed to 4.2g / L KH 2 PO 4 +2.6838g / LCaCl 2 In addition, the other conditions of sample preparation are the same as in Example 1. The result is a uniform, dense coating in appearance. Carry out coating corrosion resistance and adhesion test according to embodiment 1, the result shows: the corrosion resistance of composite treatment sample improves 69.71% compared with the direct cathodic deposition sample in the same electrolyte; Adhesion rating is the same as embodiment 1.

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Abstract

The present invention discloses a magnesium alloy surface composite treatment method. According to the method, in an electrolyte having a magnesium alloy chemical conversion capacity and a cathode deposition characteristic, a magnesium alloy is firstly subjected to a chemical conversion treatment, and then is subjected to a cathode deposition treatment, wherein the electrolyte comprises a water base or an ethanol base solution of a soluble magnesium salt, or a water base compound solution of dihydric phosphate and a soluble calcium salt, or a simulated body fluid. According to the present invention, cathode deposition and chemical conversion are organically combined, thin film layer and microscopic defects such as pores / cracks and the like of the isolated chemical conversion technology and main application defects such as poor coating / substrate binding force and the like of the isolated cathode deposition technology are concurrently overcome. With the technology of the present invention, in site green preparation of the functional composite film layer having an excellent comprehensive performance can be achieved, causative performances of the magnesium alloy can be significantly improved, and especially corrosion resistance (degradation resistance), biocompatibility and biological activity can be improved.

Description

technical field [0001] The invention belongs to the technical field of surface engineering, in particular to a composite treatment method for magnesium alloy surfaces. Background technique [0002] Attributed to abundant resources, low price and low density ("first low"), high specific strength and specific stiffness ("second high"), good casting and machinability, recycling and dimensional stability ("three good") ), electromagnetic shielding ability, shock absorption and noise reduction ability, strong thermal and electrical conductivity ("four strong") and other conventional performance advantages, in fields of great significance or special technical requirements such as "lightweight" and "environmental protection", Such as aviation, aerospace, automobile, electronics, military and other industrial sectors, the application prospect of magnesium alloy as a structural material is very bright, and enjoys the reputation of "green engineering material in the 21st century". In...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/30C25D9/12C25D11/00
Inventor 张永君赵杰莫锦添董连军
Owner SOUTH CHINA UNIV OF TECH
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