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Preparation process of electroless ni-p/ni-zn-p three-layer anode composite coating

A technology of composite coating and preparation process, which is applied in the direction of liquid chemical plating, metal material coating process, coating, etc., can solve problems such as pitting corrosion easily, and achieve the effects of low cost, simple process and low energy consumption

Active Publication Date: 2020-11-24
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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  • Preparation process of electroless 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 provides a preparation process of Ni-P / Ni-Zn-P three-layer anodic composite plating through chemical plating. According to the plating structure, an inner layer is a low phosphorus Ni-Palloy, a middle layer is a high phosphorus Ni-P alloy, and an outer layer is Ni-Zn-P plating; anodic composite plating has a gradient with the potential difference, and the electrode potential of thecomposite plating is lowered successively from the surface to a substrate. The preparation process includes the steps that the Ni-P / Ni-Zn-P three-layer anodic composite plating is prepared on carbon steel through three times of plating; and each component unit oflaminated plating, that is 'sub plating', is controlled to have the distinction of the anodic polarity and the negative polarity. According to the preparation process of the Ni-P / Ni-Zn-P three-layer anodic composite plating through chemical plating, a method of chemical plating is used for preparing the anodic composite plating for 'lamination' of each plating, internal defect dislocation of the plating are caused and consequently the plating penetration porosity is greatly lowered; and the purpose that the principle of electrochemical sacrificial anode protection is further utilized to realize effective protection of the material substrate is achieved. The Ni-P / Ni-Zn-P three-layer anodic composite plating has the characteristics of compact structure, low porosity, good corrosion resistance and high bonding force.

Description

technical field [0001] The invention relates to a preparation process for 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 preparation process. 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 averag...

Claims

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Application Information

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