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Process for preparing pretreatment layer and coating on magnesium and magnesium alloy surface

A surface pretreatment, magnesium alloy technology, applied in the direction of superimposed layer plating, metal material coating process, coating, etc., can solve the problems of poor bonding force of magnesium alloy matrix, many steps, difficult to realize, etc., to improve processing Accuracy, improvement of corrosion resistance, effect of simplified process

Inactive Publication Date: 2007-04-25
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the binding force between the galvanized layer or the pre-coated layer and the magnesium alloy substrate with high aluminum content is poor, and there are many steps, so it is not easy to realize in industry.

Method used

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  • Process for preparing pretreatment layer and coating on magnesium and magnesium alloy surface
  • Process for preparing pretreatment layer and coating on magnesium and magnesium alloy surface

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The magnesium alloy material is an AZ31 type plate, which is cut into a 1.5cm×2.5cm rectangular sample, and polished with 240, 500, 1000, and 1500 sandpaper in sequence.

[0033] (1) Ultrasonic degreasing

[0034] Ultrasonic degreasing with acetone or trichlorethylene organic solvent, operating temperature: room temperature, operating time: 10min.

[0035] (2) Alkali washing, solution preparation and operating conditions are as follows:

[0036] NaOH 50g / L, NaOH 3 PO 4 12H 2 O 10g / L, temperature 55-65°C, time 8-10 minutes.

[0037] (3) Preparation of metal replacement membrane, solution preparation and operating conditions are as follows:

[0038] CoSO 4 ·7H 2 O 2g / L, trisodium citrate 2.1g / L, pH value 5.5±0.2, temperature 20°C, time 15min.

[0039] (4) Chemical plating solution formula:

[0040] NiSO 4 ·6H 2 O 18g·L -1 , C 6 h 8 o 7 ·H 2 O 12g·L -1 , HF (40%) 10ml·L -1 , NH 4 HF 2 20g·L -1 , NaH 2 PO 2 ·H 2 O22g L -1 , Thiourea 1mg·L -1, pH v...

Embodiment 2

[0044] Grinding, ultrasonic degreasing, and alkali cleaning are the same as in Example 1. The difference from Example 1 lies in the preparation of the metal replacement membrane, solution preparation and operating conditions are as follows:

[0045] CoSO 4 ·7H 2 O 5g / L, sodium dodecylsulfonate 80mg / L, trisodium citrate 5.3g / L, pH value 6±0.2, temperature 20°C, time 15min.

[0046] Then carry out according to the (4) step in embodiment 1.

[0047] Wash in deionized water between steps.

[0048] The magnesium alloy sample of the coating obtained in this embodiment is subjected to thermal shock and file tests, and meets the requirements of the national standard GB / T13913-92.

Embodiment 3

[0050] Grinding, ultrasonic degreasing, and alkali cleaning are the same as in Example 1. The difference from Example 1 lies in the preparation of the metal replacement membrane, solution preparation and operating conditions are as follows:

[0051] CoSO 4 ·7H 2 O 8g / L, sodium dodecylsulfonate 80mg / L, trisodium citrate 8.5g / L, pH value 6.5±0.2, temperature 20°C, time 15min.

[0052] Then carry out according to the (4) step in embodiment 1.

[0053] Wash in deionized water between steps.

[0054] The magnesium alloy sample of the coating obtained in this embodiment is subjected to thermal shock and file tests, and meets the requirements of the national standard GB / T13913-92.

[0055] The following examples are the preparation methods of the single metal film Cu and the coating.

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Abstract

A preparation method for magnesium and magnesium alloy surface pretreatment and coating layer belongs to the technology field of magnesium and magnesium alloy surface treatment, processing steps is: pre-grinding, chemically degreasing, alkaline degreasing, immersing the magnesium or magnesium alloy into metal replacement fluid, generating a layer of metal replaced membrane on the workpiece surface, putting the workpiece into chemical plating liquid for chemicak plating, or electroplating solution for electroplating, washing with water between the steps. Magnesium or magnesium alloy can be preheated between metal replacement and chemical plating or steps of electroplating, or after chemical plating or electroplating. Metal membrane with catalytic activity takes the place of fluoride film; meanwhile abandon hexavalent chromium and high concentrations fluorine ions in the present process, to obtain coatings with corrosion resistance higher than that of the existing technology. The obtained metal membrane can be not only used as chemical plating basement, but also as electroplating basement, or short-term preservation for transport and short-term storage.

Description

technical field [0001] The invention belongs to the technical field of surface treatment of magnesium and magnesium alloys. In particular, it relates to a preparation method of magnesium and magnesium alloy surface coating. Background technique [0002] Magnesium alloy has the advantages of light weight, high specific strength and specific stiffness, excellent thin-walled formability and renewable performance, high thermal conductivity, good electromagnetic shielding effect, and high anti-electromagnetic interference (EMI) performance. It is very suitable for For the requirements of 3Cs (computers, communications and consumers electronics) products and electric vehicles and auto parts, it is called "metal of the times" and "metal of the 21st century". [0003] The poor corrosion resistance of magnesium alloy is the main reason restricting its further popularization and use. At present, the corrosion resistance treatment of magnesium alloy mainly includes chemical conversio...

Claims

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Application Information

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IPC IPC(8): C23C28/00C23C18/31C23G1/22C23G5/024C23F17/00
Inventor 国栋樊占国杨中东薛向欣
Owner NORTHEASTERN UNIV
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