Unlock instant, AI-driven research and patent intelligence for your innovation.

Bath formula of chemical plating for magnesium and magnesium alloy

An electroless plating and magnesium alloy technology, applied in the direction of liquid chemical plating, metal material coating technology, coating, etc., can solve the problems of low efficiency, complicated preparation, high cost, etc., and achieve efficiency improvement, preparation simplification, and cost reduction Effect

Inactive Publication Date: 2005-01-12
SHANGHAI JIAO TONG UNIV
View PDF0 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to aim at the shortcoming in the existing magnesium alloy direct chemical plating technology, provide a kind of magnesium and magnesium alloy chemical plating solution formula, replace basic nickel carbonate with nickel sulfate and introduce as nickel salt, make plating solution preparation convenient , the cost is greatly reduced, thereby solving the problems of high cost, complicated preparation and low efficiency due to the use of basic nickel carbonate

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bath formula of chemical plating for magnesium and magnesium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Take medicine by following formula: nickel sulfate 30g, citric acid 20g, hydrofluoric acid (70%) 60mL, sodium hypophosphite 30g, thiourea 0.001g, earlier above-mentioned medicine is dissolved with a small amount of distilled water respectively, mixes and dilutes to 1 liter, the pH value of the prepared plating solution is 6.5.

[0017] will area 0.8dm 2 After alkaline degreasing, pickling and activation, the magnesium alloy AZ91 castings were put into the electroless plating solution heated to 80°C and plated for 2 hours to obtain a uniform and smooth nickel-phosphorus alloy with a thickness of about 30 μm on the magnesium alloy. plating. Table 1 lists the properties of magnesium alloy electroless coatings. Among them, the value of plating speed is calculated by the average value of 4 samples according to the following formula: V = m - m 0 ...

Embodiment 2

[0025] Weigh the medicine according to the following formula: nickel sulfate 15g, citric acid 10g, ammonium bifluoride 20g, sodium hypophosphite 15g, potassium iodate 0.003g, first dissolve the above medicines with a small amount of distilled water, then mix and dilute to 1 liter, and prepare A good bath pH is 7.0.

[0026] will area 0.8dm 2 After alkaline degreasing, pickling and activation, the magnesium alloy AZ91 castings were put into the electroless plating solution heated to 80°C and plated for 2 hours to obtain a uniform and smooth nickel-phosphorus alloy with a thickness of about 20 μm on the magnesium alloy. plating. After testing, the bonding strength of the coating is qualified, and the salt spray test can reach 48 hours.

Embodiment 3

[0028] Weigh the medicine according to the following formula: nickel sulfate 40g, citric acid 30g, ammonium fluoride 60g, sodium hypophosphite 40g, lead acetate 0.0005g, first dissolve the above medicines with a small amount of distilled water, then mix and dilute to 1 liter, and prepare The pH value of the bath is 7.0.

[0029] will area 0.8dm 2 After alkaline degreasing, pickling and activation, the magnesium alloy AZ91 castings were put into the electroless plating solution heated to 80°C and plated for 2 hours to obtain a uniform and smooth nickel-phosphorus alloy with a thickness of about 30 μm on the magnesium alloy. plating. After testing, the bonding strength of the coating is qualified, and the salt spray test can reach 72 hours.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A Mg and its alloy chemical liquor formula includes the following components and weight percentage: NiSO4: 1.5-4%, citric acid, 1-3%, fluoride: 2-6%, sodium sub-hypophosphite 1.5-4%, additives: 0.00005-0.0003%, rest is water. The advantage is to use NiSO4 to replace basic Ni carbonate as Ni salt which can greatly reduce the cost of the chemical plating.

Description

technical field [0001] The invention relates to an electroless plating solution formula, in particular to a magnesium and magnesium alloy electroless plating solution formula. It is used in the field of surface treatment of metal materials. Background technique [0002] Magnesium alloy is the lightest metal structure material in practical application. It has the advantages of small specific gravity, high specific strength and specific stiffness, good damping, machinability and casting performance. It is widely used in automobiles, machinery, aerospace fields and portable electronic instruments, Computers, hand tools, and camera components are increasingly being used. However, poor corrosion resistance is one of the main factors limiting the wide application of magnesium alloys. Electroless nickel plating on magnesium alloys can not only obtain high corrosion resistance and wear resistance, but also obtain uniform thickness coatings on castings with complex shapes. It is a...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C23C18/36
Inventor 刘新宽胡文彬丁文江向阳辉
Owner SHANGHAI JIAO TONG UNIV