Plating liquid with high phosphoric acidity for chemical plating Ni-P alloy

A high phosphoric acid chemistry and plating solution technology, applied in the direction of metal material coating process, etc., can solve the problems of low plating speed, lack of alkali resistance of the coating, poor stability of the plating solution, etc. Excellent effect of alkaline corrosion performance

Inactive Publication Date: 2007-03-07
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

There are researches on high-phosphorus electroless plating process in China, such as the preparation process of a high-phosphorus electroless plating Ni-P alloy, which is based on NiSO 4 ·6H 2 O is the main salt, NaH 2 PO 2 ·H 2 O is a reducing agent, citric acid is the main complexing agent, and malonic acid and potassium sodium tartrate are auxiliary complexing agents. However, the plating speed of this process is not high, the stability of the plating solution is not good, and the coating lacks alkali resistance.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: after the pretreatment of the carbon steel workpiece to be plated is qualified, three kinds of concentrated solutions of A, B and C are prepared according to the following formula, the A solution mainly contains nickel salt, the B solution mainly contains sodium hypophosphite, and the C solution mainly contains Reducing agents and complexing agents, etc. Use A liquid 60ml / L and B liquid 150ml / L when opening the tank, and add A and C liquids at a ratio of 1:1 when adding the plating solution.

[0020] Nickel Sulfate (NiSO 4 ·6H 2 O) 26g / L;

[0021] Sodium hypophosphite (NaH 2 PO 2 ·H 2 O) 30g / L;

[0022] Main complexing agent lactic acid 18g / L

[0023] Auxiliary complexing agent glycine 4g / L

[0024] Auxiliary complexing agent EDTA 8g / L

[0025] Auxiliary complexing agent citric acid 6g / L

[0026] Accelerator succinic acid 20g / L

[0027] Buffer NaAC 15g / L

[0028] Stabilizer KIO 3 0.02g / L

[0029] Surfactant OP-10 0.5ml / L

[...

Embodiment 2

[0036] Embodiment 2: As described in Embodiment 1, the difference is

[0037] Main complexing agent lactic acid 27g / L

[0038] Auxiliary complexing agent glycine 12g / L

[0039] Auxiliary complexing agent EDTA 8g / L

[0040] Accelerator succinic acid 10g / L

[0041] PH value 4.67

[0042] Plating with this plating solution process can make the average plating speed reach 12.6μm / h, the phosphorus content of the coating reaches 11.86wt%, and the coating is far superior to carbon steel (A 3 steel), Cl-resistant - The corrosion resistance is better than 304 stainless steel.

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PUM

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Abstract

The invention discloses a high-phosphoric chemical coated Ni-P alloy depositing liquid, which is characterized by the following: adopting NiSO4 .6H2O as main salt, NaH2PO2 .H2O as reducer, lactic acid as main complex builder and citrate, glycine, EDTA disodium as auxiliary complex builder; making amber acid as accelerant and KIO3 as stabilizer; adding non-ion surface activator OP-10. The PdCl2 stability is superior by 2400s in the accelerating erosion experience, which possesses 11-13wt% phosphor.

Description

technical field [0001] The invention relates to a highly phosphoric acid electroless Ni-P alloy plating solution. Using the plating solution and a conventional chemical plating process, a coating with excellent corrosion resistance can be obtained, and is especially suitable for an anticorrosion coating with carbon steel as a base material. Background technique [0002] Petrochemical equipment is in a harsh environment of high temperature and high pressure corrosion, the service life of the equipment is generally very short, and the economic loss caused by equipment corrosion is huge. At present, domestic and foreign petrochemical anti-corrosion technologies mainly use organic coatings for anti-corrosion, special materials such as stainless steel, special alloy steel, etc. In recent years, there have also been reports of using electroless coatings for anti-corrosion. Organic coating anti-corrosion, mature technology, wide variety of coatings, wide application, but in the pet...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/08C23C22/07
Inventor 张树生程林
Owner SHANDONG UNIV
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