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Removing solution of nickel phosphorus alloy coating on magnesium alloy

A nickel-phosphorus alloy and coating stripping technology, which is applied in the field of nickel-phosphorus alloy coating stripping solution on magnesium alloy, can solve problems such as difficult to meet actual needs, complicated operation steps, and poor stripping effect, and achieve low cost and simple operation , easily controlled effects

Inactive Publication Date: 2013-09-11
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above-mentioned stripping solutions and stripping methods have problems such as unclean stripping, complicated operation steps, and over-corrosion to varying degrees, and the effect of multiple stripping is poor, so it is difficult to meet actual needs.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Embodiment 1: a nickel-phosphorus alloy coating stripping solution on magnesium alloy, it is the aqueous solution that is made up of nitric acid, hydrofluoric acid, cetyl bromide, allyl thiourea, phytate, wherein, 68 The content of % nitric acid is 300ml / L, the content of 40% hydrofluoric acid is 400ml / L, the content of cetylpyridine bromide is 20mg / L, the content of allylthiourea is 10mg / L, and the content of potassium phytate is 10mg / L. When in use, put the magnesium alloy parts coated with nickel-phosphorus alloy coating into the above-mentioned stripping solution at room temperature, and the stripping time can reach 1-3 minutes; it can effectively strip the nickel-plated layer and Electroless nickel-phosphorus plating, especially for nickel-plating and electroless nickel-phosphorus plating on magnesium alloy parts with complex shapes, has a good removal effect. The stripped matrix is ​​uniform, and the stripping solution does not corrode and damage the matrix.

Embodiment 2

[0015] Embodiment 2: a nickel-phosphorus alloy coating stripping solution on magnesium alloy, it is the aqueous solution that is made up of nitric acid, hydrofluoric acid, cetyl bromide, allyl thiourea, phytate, wherein, 68 The content of % nitric acid is 200ml / L, the content of 40% hydrofluoric acid is 420ml / L, the content of cetylpyridine bromide is 5mg / L, the content of allylthiourea is 15mg / L, and the content of sodium phytate is 10mg / L. When in use, put the magnesium alloy parts coated with nickel-phosphorus alloy coating into the above-mentioned stripping solution at room temperature, and the stripping time is 30 seconds; it can effectively strip the nickel-plated layer and electroless nickel-phosphorus plating on the magnesium alloy parts layer. The stripped substrate is even and does not corrode or damage the substrate.

Embodiment 3

[0016] Embodiment 3: a nickel-phosphorus alloy coating stripping solution on a magnesium alloy is characterized in that: it is an aqueous solution composed of nitric acid, hydrofluoric acid, cetyl bromide, allyl thiourea, and phytate , wherein the content of 68% nitric acid is 400ml / L, the content of 40% hydrofluoric acid is 200ml / L, the content of cetylpyridinium bromide is 15mg / L, the content of allylthiourea is 5 mg / L, Potassium phytate content is 5mg / L. When in use, put the magnesium alloy parts coated with nickel-phosphorus alloy coating into the above-mentioned stripping solution at room temperature, and the stripping time is 10 seconds to 1 minute, which can effectively strip the nickel coating and chemical Nickel-phosphorus plating, especially for nickel-plating and electroless nickel-phosphorus plating on magnesium alloy parts with complex shapes, has a good removal effect.

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PUM

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Abstract

The invention relates to a removing solution of a nickel phosphorus alloy coating on magnesium alloy, which is a water solution composed of nitric acid, hydrofluoric acid, bromo-cetyl-pyridine, allylthiourea and phytate, wherein content of 68% nitric acid is 200-400ml / L, content of 40% hydrofluoric acid is 200-420ml / L, content of the bromo-cetyl-pyridine is 5-20mg / L, content of allylthiourea is 5-15mg / L and content of the phytate is 5-15mg / L. Under room temperature, magnesium alloy parts are placed in the removing solution, and the removing time is 10 seconds to 3 minutes. The removing solution is capable of effectively removing a chemical nickel and phosphorus coating on a magnesium alloy part, and a base body receiving the removing process is even and cannot be corroded. The removing solution is simple in composition, reasonable in prescription and capable of being used for multiple removing and maintaining of disqualified nickel phosphorus alloy coatings in chemical plating of the magnesium alloy.

Description

technical field [0001] The invention relates to a chemical stripping solution, in particular to a nickel-phosphorus alloy coating stripping solution on a magnesium alloy. Background technique [0002] The density of magnesium alloy is two-thirds of that of aluminum alloy and one-fourth of that of iron, making it one of the lightest structural metal materials. Magnesium alloy also has the advantages of good machinability, high specific strength, high specific stiffness, good damping, good thermal conductivity, etc. It can replace steel, aluminum alloy, plastic and other parts, and has a wide range of applications in the fields of automobiles, electronics, aerospace, etc. Application prospect. [0003] Magnesium is an extremely active metal with a standard potential of -2.36V, and its corrosion resistance is extremely poor. Therefore, magnesium alloy materials must be properly surface treated before use to improve their corrosion resistance. Among many surface treatment meth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F1/28
Inventor 曹立新刘海萍毕四富
Owner HARBIN INST OF TECH AT WEIHAI
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