Magnesium alloy surface phosphorization treatment fluid and treatment method thereof

A technology of surface phosphating and magnesium alloy, applied in the direction of metal material coating process, etc., can solve the problem of toxic nitrite ions, and achieve the effects of simple composition, shortened reaction time, and dense film layer.

Inactive Publication Date: 2008-03-26
HARBIN ENG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The existing phosphating treatment method is to add nitrite ion or potassium permanganate salt in the phosphating solution as an oxidant to be reduced to accelerate the phosphating, but the nitrite ion is poisonous, so the development of an environmentally friendly treatment solution has been developed. become inevitable

Method used

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  • Magnesium alloy surface phosphorization treatment fluid and treatment method thereof
  • Magnesium alloy surface phosphorization treatment fluid and treatment method thereof

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Experimental program
Comparison scheme
Effect test

specific Embodiment approach 1

[0025] The composition of the magnesium alloy phosphating film forming solution is composed of

[0026] Phosphating solution composition

content

85% phosphoric acid

10ml / l

Zinc oxide

1g / l

sodium fluoride

1g / l

sodium nitrate

0.1g / l

hydrogen peroxide

0.5g / l

[0027] The preparation method is as follows: the sample is die-casting AZ91D magnesium alloy

[0028] 1) Mechanical pretreatment: use 1000 # Grinding with metallographic sandpaper to remove foreign matter, reduce surface roughness, and then wash with water;

[0029] 2) Degreasing: washing with 10% NaOH solution, the temperature is controlled between 50°C for 5 minutes, and then washed with water;

[0030] 3) pickling: use 75% H 3 PO 4 Solution washing to remove surface oxides, the temperature is controlled at 30°C for 1 minute, and then washed with water;

[0031] 4) Activation: At a temperature of 40°C, use HF (46%) 200ml / l to remove...

specific Embodiment approach 2

[0034] Phosphating solution composition

[0035] Its preparation method is the same as specific embodiment 1

specific Embodiment approach 3

1g / l

[0038] Its preparation method is the same as specific embodiment 1

[0039] The polarization curves of AZ91D and phosphorylated AZ91D were measured in 3.5% NaCl, as shown in Figure 1.

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Abstract

The present invention magnesium alloy material surface phosphatizing solution and its treating process. The surface phosphatizing solution consists of 85 % concentration phosphoric acid solution in 10-20 ml/l, zinc oxide in 1-5 g/l, sodium fluoride in 1-3 g/l, sodium nitrate in 0.1-0.4 g/l, hydrogen peroxide in 0.5-1 g/l and water for the rest. Hydrogen peroxide is adopted as the promoter to speed film formation and raise the corrosion resistance of the produced conversion film and adhesion of the lacquer film, and as the environment friendly oxidant. The surface phosphatizing solution has simple composition, easy control, stable technological process and low cost, and is suitable for industrial production.

Description

(1) Technical field [0001] The invention provides a metal surface treatment method, in particular a magnesium alloy surface treatment method. (2) Background technology [0002] Magnesium alloys have excellent properties such as low density, high specific stiffness and specific strength, but due to their high chemical activity and low electrode potential, the corrosion resistance of magnesium alloys is poor, which restricts the use of magnesium alloys. At present, the commonly used methods to improve the corrosion resistance of magnesium alloys mainly include chemical conversion coating treatment, anodizing, plasma micro-arc anodizing, surface infiltration layer, laser surface treatment and so on. Among them, chemical conversion coating treatment is an effective method for surface protection of magnesium alloys. Chemical conversion coating treatment can be mainly divided into chromium treatment and chromium-free treatment. Chromation treatment will cause serious environmental...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/34C23C22/78C23G1/22C23G1/12
Inventor 张涛刘晓兰王福会
Owner HARBIN ENG UNIV
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