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Electroless plating ni-p/ni-zn-p three-layer anode composite coating

A composite coating, ni-zn-p technology, applied in the direction of liquid chemical plating, coating, metal material coating technology, etc., can solve problems such as pitting corrosion easily, achieve low cost, simple process, and low energy consumption Effect

Active Publication Date: 2020-11-10
DALIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the single-layer alloy coating has a small amount of pores and is prone to pitting corrosion. Therefore, there is an urgent need for a coating with good corrosion resistance in this field.

Method used

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  • Electroless plating ni-p/ni-zn-p three-layer anode composite coating

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The bath configuration:

[0031] The first step is to select the raw material of the plating solution;

[0032] Nickel sulfate (purity>99%); zinc sulfate (purity>99.5%); sodium hypophosphite (purity>98%); glycine (purity>99%); citric acid (purity>99.5%); thiourea ( Purity >98%); Ammonium Citrate (Purity >99%); Sodium Acetate (Purity >95%); Glycine (Purity >98%); Ethylenediamine (Purity >99.9%);

[0033] The second step is to polish the sample;

[0034] The third step, alkali washing degreasing;

[0035] The fourth step, ultrasonic cleaning;

[0036] The fifth step, hydrochloric acid activation;

[0037] The sixth step, one-time plating: nickel sulfate 5g L -1 , sodium hypophosphite 5g·L -1 , citric acid 1.0g·L -1 , sodium acetate 6g·L -1 ; Glycine 15g L -1 , temperature 85°C; PH value: 5; time 1h;

[0038] The seventh step, washing;

[0039] The eighth step, the second plating: nickel sulfate 20g L -1 , sodium hypophosphite 20g·L -1 , citric acid 1.5g·L -1...

Embodiment 2

[0044] The first step is to select the raw material of the plating solution;

[0045] Nickel sulfate (purity>99%); zinc sulfate (purity>99.5%); sodium hypophosphite (purity>98%); glycine (purity>99%); citric acid (purity>99.5%); thiourea ( Purity >98%); Ammonium Citrate (Purity >99%); Sodium Acetate (Purity >95%); Glycine (Purity >98%); Ethylenediamine (Purity >99.9%);

[0046] The second step is to polish the sample;

[0047] The third step, alkali washing degreasing;

[0048] The fourth step, ultrasonic cleaning;

[0049] The fifth step, hydrochloric acid activation;

[0050] The sixth step, one-time plating: nickel sulfate 10g L -1 , sodium hypophosphite 15g·L -1 , citric acid 1.0g·L -1 , sodium acetate 6g·L -1 ; Glycine 15g L -1 , temperature 85°C; PH value: 5; time 2h;

[0051] The seventh step, washing;

[0052] The eighth step, the second plating: nickel sulfate 25g L -1 , sodium hypophosphite 25g·L -1 , citric acid 1.5g·L -1 , sodium acetate 9g·L -1 ; Gly...

Embodiment 3

[0057] The first step is to select the raw material of the plating solution;

[0058] Nickel sulfate (purity>99%); zinc sulfate (purity>99.5%); sodium hypophosphite (purity>98%); glycine (purity>99%); citric acid (purity>99.5%); thiourea ( Purity >98%); Ammonium Citrate (Purity >99%); Sodium Acetate (Purity >95%); Glycine (Purity >98%); Ethylenediamine (Purity >99.9%);

[0059] The second step is to polish the sample;

[0060] The third step, alkali washing degreasing;

[0061] The fourth step, ultrasonic cleaning;

[0062] The fifth step, hydrochloric acid activation;

[0063] The sixth step, one-time plating: nickel sulfate 15g L -1 , sodium hypophosphite 20g·L -1 , citric acid 1.0g·L -1 , sodium acetate 6g·L -1 ; Glycine 15g L -1 , temperature 95°C; PH value: 6; time 2h;

[0064] The seventh step, washing;

[0065] The eighth step, the second plating: nickel sulfate 30g L -1 , sodium hypophosphite 30g·L -1 , citric acid 1.5g·L -1 , sodium acetate 9g·L -1 ; Gly...

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Abstract

The invention relates to an anode composite coating with chemical plating Ni-P / Ni-Zn-P three coatings. The coating structure comprises a low-phosphorous Ni-P alloy inner coating, a high-phosphorus Ni-P alloy intermediate coating and a Ni-Zn-P outer coating, and the gradient of potential difference exists among the coatings of the anode composite coating; and the electrode potential of the composite coating is decreased from the surface to a substrate in sequence. According to the anode composite coating, the anode composite coating formed by overlapping the coatings is prepared with the chemical plating method, and consequently the internal defects of the coatings are staggered so that the coating penetrating porosity is reduced greatly; and the purpose that the material substrate is protected effectively according to the electrochemical sacrificial anode protection principle is further achieved. The coating has the characteristics of the compact structure, low porosity, high corrosionresistance and strong binding force.

Description

technical field [0001] The invention relates to electroless Ni-P / Ni-Zn-P three-layer anode composite coating on the surface of metal materials, in particular to a carbon steel surface electroless Ni-P / Ni-Zn-P three-layer anode composite coating. Background technique [0002] The surface area of ​​the ocean accounts for about 71% of the earth, and it has extremely rich biological resources and mineral resources. my country's mineral resources development technology and seabed exploration have developed rapidly in recent years, such as deep-water semi-submersible drilling platforms, "Manatee" multi-purpose drilling rigs, deep-water pipeline laying, etc. The construction of these facilities will inevitably use a lot of metal materials. The corrosion loss of metal materials in the ocean is very serious, which brings huge losses to the national economy. In March 2018, the global corrosion survey report showed that the world's average corrosion loss accounted for about 3.4% of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C18/36C23C18/50C23F13/14
CPCC23C18/1651C23C18/36C23C18/50C23F13/14
Inventor 付传起王宙杨梓健高越
Owner DALIAN UNIV
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