Alkaline scale remover for magnesium alloy

A descaling agent and magnesium alloy technology, applied in the field of magnesium alloy alkaline descaling agent, can solve the problems of polluting the environment, unfavorable to the health of workers, easy to generate harmful gases, etc., achieve uniform surface of the substrate, protect the environment and human health, more cohesive effect

Pending Publication Date: 2019-03-15
GUANGZHOU SANFU NEW MATERIALS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The currently commonly used descaling is usually an acidic system. This method is prone to produce harmful gases during the descaling process, pollutes the environment, and is not conducive to the health of workers.

Method used

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  • Alkaline scale remover for magnesium alloy
  • Alkaline scale remover for magnesium alloy
  • Alkaline scale remover for magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The magnesium alloy alkaline descaling agent of the present embodiment comprises the component of following content:

[0023] Compound alkali 170g / Kg, complexing agent 35g / Kg, activator 13g / Kg, corrosion inhibitor 45g / Kg, desorption agent 1g / Kg, and the rest water. Wherein, compound base is provided by sodium hydroxide, salt of wormwood (sodium hydroxide 130g / Kg, potassium carbonate 40g / Kg); Complexing agent is provided by sodium glucoheptonate and phytic acid (sodium glucoheptonate content 20g / Kg, phytic acid 15g / Kg); Activator is provided by potassium fluoride and triethanolamine (potassium fluoride 8g / Kg, triethanolamine 5g / Kg); Corrosion inhibitor is provided by sodium nitrate; Desorption agent is provided by alkane Glycoside (AG6202 from Aksu Company) and EO-PO polymer (BL240, Solvay Company) to provide (0.6g / Kg for AG6202, 0.4g / Kg for BL240).

Embodiment 2

[0025] The magnesium alloy alkaline descaling agent of the present embodiment comprises the component of following content:

[0026] Compound alkali 200g / Kg, complexing agent 50g / Kg, activator 10g / Kg, corrosion inhibitor 30g / Kg, desorption agent 3g / Kg, and the rest water. Wherein, the complex base is provided by potassium hydroxide, sodium silicate and sodium carbonate (potassium hydroxide 150g / Kg, sodium silicate 30g / Kg, sodium carbonate 20g / Kg); sodium phosphate and polyacrylamide (disodium EDTA content 30g / Kg, sodium glucoheptonate 15g / Kg polyacrylamide 5g / Kg); activator is provided by sodium fluoride and ammonia water (sodium fluoride 6g / Kg , ammoniacal liquor 4g / Kg); Corrosion inhibitor is provided by sodium nitrite and urea (sodium nitrite content is 20g / Kg, and urea content is 10g / Kg); Desorption agent is provided by betaine and AEO-7 (beet Alkali is 1g / Kg, AEO-7 is 2g / Kg).

Embodiment 3

[0028] The magnesium alloy alkaline descaling agent of the present embodiment comprises the component of following content:

[0029] Compound alkali 240g / Kg, complexing agent 30g / Kg, activator 8g / Kg, corrosion inhibitor 50g / Kg, desorption agent 2g / Kg, and the rest water. Wherein, compound base is provided by sodium silicate, potassium silicate, potassium carbonate (sodium silicate 100g / Kg, potassium silicate 110g / Kg, potassium carbonate 30g / Kg); complexing agent is by sodium glucoheptonate and phenol Sulfonic acid is provided (sodium glucoheptonate content 25g / Kg, phenol sulfonic acid 5g / Kg), the activator is provided by ammonium hydrogen fluoride and sodium fluoroborate (amine hydrogen fluoride 4g / Kg, sodium fluoroborate 4g / Kg), slow The etchant is provided by benzotriazole, and the desorbent is provided by diethylene glycol monobutyl ether and EO-PO polymer (BL240, Solvay Company) (diethylene glycol monobutyl ether is 1.5g / Kg, BL240 is 0.5g / Kg).

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Abstract

The invention discloses an alkaline scale remover for a magnesium alloy. The alkaline scale remover per kg is prepared from 150-300 g of compound alkali, 10-60 g of a complexing agent, 5-15 g of an activator, 20-60 g of a corrosion inhibitor, 1-5 g of a desorption agent, and the balance water. By adjusting the proportion of the complexing agent, the activator, the corrosion inhibitor and the desorption agent in the alkaline scale remover for the magnesium alloy and by the action of ultrasound, an ash film on the surface of the magnesium alloy can be uniformly desorbed, so that a white metal substrate surface is exposed. The substrate surface is uniform without corrosion spots and residual ash film. The subsequent zinc deposition electroplating is performed on the surface of the substratesurface so that the binding force between the substrate surface and a coating can be improved. The alkaline scale remover for the magnesium alloy does not produce any harmful gases in the descaling process, and is beneficial to protecting the environment and ensuring human health. A copper-nickel-chromium electroplating process can be used for subsequent electroplating production, so that the binding force between an electroplating layer and a matrix is better.

Description

technical field [0001] The invention relates to a magnesium alloy alkaline descaling agent. Background technique [0002] Magnesium and its alloys have high specific strength, low density, good shock absorption, thermal conductivity, electrical conductivity, electromagnetic shielding, machining performance and recycling performance, so the application of magnesium alloys has been attracting attention. [0003] The poor chemical activity and corrosion resistance of magnesium and its alloys hinder its large-scale application, so it is necessary to electroplate or spray the gold surface of magnesium alloys to form a protective film and improve the corrosion resistance of magnesium alloys. Magnesium alloys must be pre-treated before electroplating or spraying to remove putty and dirt on the surface of magnesium alloys. After the magnesium alloy has been degreased and pickled, there are still many gray-black film layers on the surface. The existence of these film layers will red...

Claims

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Application Information

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IPC IPC(8): C23G1/22C23G1/16C23G1/18
CPCC23G1/16C23G1/18C23G1/22
Inventor 田志斌郭艳红官金詹益腾
Owner GUANGZHOU SANFU NEW MATERIALS TECH
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