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Method for chemically plating double-layer Ni-P plating layer

A technology of chemical plating and coating, applied in the direction of liquid chemical plating, coating, metal material coating technology, etc., can solve the problems of increasing production hours, raw materials, and product cost, and achieve easy wastewater treatment, stable plating solution, The effect of low cost

Inactive Publication Date: 2012-08-22
GUANGZHOU HONWAY TECH CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the thickness of the Ni-P coating reported abroad is generally 30~75μm. Increasing the thickness of the coating can reduce defects such as pores and improve the corrosion resistance of the coating, but it will undoubtedly increase the production hours and raw materials, and increase the product cost.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Chemical degreasing: Use the non-phosphorus degreasing powder for steel parts to chemically degrease the 45# steel workpiece. The concentration of degreasing powder in the degreasing liquid is 50 g / L, the temperature is 60℃, and the time is 3-6min;

[0039] 2) Wash with water;

[0040] 3) Pickling and derusting: derusting in 30% hydrochloric acid by volume for 1 min;

[0041] 4) Wash with water;

[0042] 5) First activation: activation in 10% sulfuric acid for 20s;

[0043] 6) Wash with water;

[0044] 7) Pure water washing;

[0045] 8) Electroless acidic high-phosphorus Ni-P layer: use the following formula of the electroless acidic high-phosphorus Ni-P layer plating solution, plating at a temperature of 86°C for 50 minutes; the electroless acid low-phosphorus Ni-P layer The formulation of the plating solution is: nickel sulfate hexahydrate 21g / L, sodium hypophosphite 36g / L, compound complexing agent 155ml / L, compound stabilizer 11ml / L, compound brightener 5ml / L, pH 4.2, and i...

Embodiment 2

[0055] 1) Chemical degreasing: use alloy parts degreasing powder to chemically degrease brass workpieces. The degreasing powder concentration in the degreasing liquid is 50 g / L, the temperature is 60°C, and the time is 3-6 minutes;

[0056] 2) Wash with water;

[0057] 3) First activation: activation in 5% sulfuric acid for 10s;

[0058] 4) Water washing;

[0059] 5) Pure water washing;

[0060] 6) Electroless acidic high-phosphorus Ni-P layer: use the following formula of the electroless acidic high-phosphorus Ni-P layer plating solution, plating at a temperature of 88°C for 60 minutes; the electroless acid low-phosphorus Ni-P layer The formulation of the plating solution is: nickel sulfate hexahydrate 23g / L, sodium hypophosphite 37g / L, complex complexing agent 160ml / L, complex stabilizer 9ml / L, complex brightener 7ml / L, pH 4.5, and it is required for preparation Adjust the pH with pure water, 10% sulfuric acid solution and 10% sodium hydroxide solution by volume;

[0061] 7) Wash wit...

Embodiment 3

[0070] 1) Chemical degreasing: use non-ferrous metal degreasing powder to chemically degrease the 5086# aluminum workpiece, the concentration of degreasing powder in the degreasing liquid is 50g / L, the temperature is 60℃, and the time is 3-6min;

[0071] 2) Wash with water;

[0072] 3) Alkaline etching: Alkaline etching of the base material with aluminum alloy alkali etching powder;

[0073] 4) Wash with water;

[0074] 5) Descaling: Use acidic descaling agent for descaling;

[0075] 6) Wash with water;

[0076] 7) One-time zinc immersion: zinc immersion solution for aluminum alloy;

[0077] 8) Wash with water;

[0078] 9) Zinc removal: Zinc removal in 1:1 nitric acid (volume ratio);

[0079] 10) Wash with water;

[0080] 11) Secondary zinc dip;

[0081] 12) Wash with water;

[0082] 13) Pure water washing;

[0083] 14) Electroless acid high-phosphorus Ni-P layer: use the following formula of the electroless acid high-phosphorus Ni-P layer plating solution, plating 55min at a temperature of 90°...

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PUM

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Abstract

The invention relates to a method for chemically plating a double-layer Ni-P plating layer on different matrixes. The method comprises the following steps of: (1) chemical oil removal: removing oil of a workpiece in oil removal liquid; (2) first activation: activating in sulfuric acid with volume fraction of 5-10%; (3) chemically plating an acid high-phosphorus Ni-P layer; (4) second activation: activating in sulfuric acid with volume fraction of 10%; (5) chemically plating an acid low-phosphorus Ni-P layer; and (6) carrying out treatment after plating. In the invention, the workpiece is chemically plated with the acid high-phosphorus Ni-P layer which is then plated with the acid low-phosphorus Ni-P layer; the plating layer has the advantages of good binding force, good uniformity and density, high hardness, corrosion resistance and strong wear resistance; the low-phosphorus and high-phosphorus chemical plating Ni-P liquid does not contain toxic heavy metal elements such as lead, cadmium, hexavalent chromium and the like, thus the harm to the environment and human bodies is reduced, and the liquid is environment-friendly plating liquid; and meanwhile, the wastewater is easy to treat at low cost, and the life cycle of the plating liquid is long.

Description

Technical field [0001] The invention relates to a method for electroless Ni-P plating, in particular to a method for electroless plating a double-layer Ni-P coating. Background technique [0002] The electroless amorphous nickel-phosphorus (Ni-P) alloy coating has excellent resistance to NaCl, H 2 S and CO 2 Corrosion performance and good wear resistance. At present, single-layer electroless Ni-P plating is mostly used. The single-layer Ni-P alloy electroless plating layer is a closed protective layer (ie cathodic protective layer) for steel materials, and only when the plating layer is absolutely intact (ie no porosity) It plays a protective role. If there are defects such as pores, the plating layer and the matrix in the defect will form a corrosion cell and be corroded. Due to the small area of ​​the matrix at the pores and the high current density, the coating will not only have no protective effect on the matrix at this time, but will accelerate its corrosion. At present,...

Claims

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Application Information

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IPC IPC(8): C23C18/32C23C18/36
Inventor 张晓明赵国鹏林继月胡耀红鹿轩
Owner GUANGZHOU HONWAY TECH CORP
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