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

An Electromagnetic Pure Iron Electroless Nickel-Phosphorus Alloy Plating Process

An electroless nickel-phosphorus, electromagnetic pure iron technology, applied in liquid chemical plating, metal material coating process, coating, etc. problems, to achieve the effect of improving anti-corrosion ability, increasing density, and increasing surface roughness

Active Publication Date: 2022-07-12
SHENYANG AEROSPACE XINGUANG GRP
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above problems, the present invention provides an electromagnetic pure iron electroless nickel-phosphorus alloy plating process, which solves the problems of poor bonding between the coating and the base metal, peeling of the coating, and easy generation of rust spots or rust spots.

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Step 1. Remove oil, put electromagnetic pure iron in NaOH content of 20g / L, Na 2 CO 3 50g / L, Na 3 PO 4 20g / L, Na 2 SiO 3 5g / L, the balance is water for degreasing, the temperature is 60℃, and the time is 15min;

[0031] Step 2, washing with hot water, washing with hot water with a temperature of 90 °C;

[0032] Step 3. Wash with cold water until the water film does not break for a continuous time of 30s;

[0033] Step 4. Weak corrosion, with an aqueous solution containing HCl 50g / L, for 3 to 5s at room temperature;

[0034] Step 5. Wash with cold water and clean with cold water;

[0035] Step 6, washing with hot water, washing with hot water with a temperature of 90 °C;

[0036] Step 7, chemical oxidation, put electromagnetic pure iron in NaOH 550g / L, NaNO 2 250g / L, the balance is water for oxidation, the temperature is 135℃, and the time is 30min;

[0037] Step 8. Wash with hot water, wash with hot water with a temperature of 90°C;

[0038] Step 9, wash ...

Embodiment 2

[0049] Step 1. Remove oil, put electromagnetic pure iron in NaOH content of 50g / L, Na 2CO 3 30g / L, Na 3 PO 4 30g / L, Na 2 SiO 3 3g / L, the balance is water for degreasing, the temperature is 80℃, and the time is 10min;

[0050] Step 2, washing with hot water, washing with hot water with a temperature of 80 °C;

[0051] Step 3. Wash with cold water until the water film does not break for a continuous time of 30s;

[0052] Step 4. Weak corrosion, with HCl 100g / L aqueous solution, corrosion at room temperature for 3-5s;

[0053] Step 5. Wash with cold water and clean with cold water;

[0054] Step 6, washing with hot water, washing with hot water with a temperature of 80 °C;

[0055] Step 7, chemical oxidation, put electromagnetic pure iron in NaOH 650g / L, NaNO 2 180g / L, the balance is water for oxidation, the temperature is 140℃, and the time is 25min;

[0056] Step 8. Wash with hot water, wash with hot water with a temperature of 80°C;

[0057] Step 9, wash with co...

Embodiment 3

[0068] Step 1. Remove oil, put electromagnetic pure iron in NaOH content of 35g / L, Na 2 CO 3 40g / L, Na 3 PO 4 25g / L, Na 2 SiO 3 4g / L, the balance is water for degreasing, the temperature is 90℃, and the time is 5min;

[0069] Step 2, washing with hot water, washing with hot water with a temperature of 70 °C;

[0070] Step 3. Wash with cold water until the water film does not break for a continuous time of 30s;

[0071] Step 4. Weak corrosion, using an aqueous solution containing HCl 75g / L for 3-5s at room temperature;

[0072] Step 5. Wash with cold water and clean with cold water;

[0073] Step 6, washing with hot water, washing with hot water with a temperature of 70 °C;

[0074] Step 7, chemical oxidation, put electromagnetic pure iron in NaOH 600g / L, NaNO 2 200g / L, the balance is water for oxidation, the temperature is 145℃, and the time is 20min;

[0075] Step 8. Wash with hot water, wash with hot water with a temperature of 70°C;

[0076] Step 9, wash with...

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

The invention relates to a process for electroless nickel-phosphorus alloy plating on electromagnetic pure iron, aiming at the problems that the electroless nickel-phosphorus alloy plating on electromagnetic pure iron is not firmly bonded to the base metal, the coating is peeled, and rust spots or rust spots are easily generated. Before the alloy, chemical oxidation treatment was added to the electromagnetic pure iron. After the chemical oxidation treatment, dilute hydrochloric acid was used to remove the chemical oxide film layer. By improving the surface activation degree of the electromagnetic pure iron, the surface roughness of the electromagnetic pure iron was increased, thereby increasing the coating layer. Bond strength. On the other hand, in order to improve the anti-corrosion ability of the electroless nickel-phosphorus alloy coating on electromagnetic pure iron, after electroless nickel-phosphorus alloy plating, do not wash with cold water to prevent the density of the coating from being severely affected by the change of cold and heat, and directly Hot water rinse. In addition, after drying with oil-free compressed air, the electromagnetic pure iron is put into a drying box for drying, which increases the bonding strength of the electromagnetic pure iron electroless nickel-phosphorus alloy plating, and improves the density of the coating layer, thereby improving the electromagnetic pure iron. Corrosion resistance of pure iron.

Description

technical field [0001] The invention belongs to the technical field of electroless nickel-phosphorus alloy plating on the surface of electromagnetic pure iron for aerospace, and particularly relates to a process for electroless nickel-phosphorus alloy plating on electromagnetic pure iron. Background technique [0002] Electromagnetic pure iron is a high-quality steel with an iron content of more than 99.5%. It is a low-carbon, low-sulfur, and low-phosphorus iron material. As a widely used soft magnetic material, electromagnetic pure iron has a high magnetic induction intensity and is very suitable for making magnetic parts that work in strong magnetic fields. In the field of aerospace and aviation, electromagnetic pure iron is a very important metal material. However, the surface of the electromagnetic pure iron material is easily oxidized when exposed in the air. Generally, the electromagnetic pure iron produced by mechanical processing has oil stains and oxides on the sur...

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 Patents(China)
IPC IPC(8): C23C18/36C23C18/18
CPCC23C18/36C23C18/1844
Inventor 张国全张建王建
Owner SHENYANG AEROSPACE XINGUANG GRP