Preparation method of metal surface plating layer structure applicable to ocean severe corrosion environment

A metal surface, strong corrosion technology, applied in the direction of metal material coating process, etc., can solve problems such as zinc hoarfrost of the coating, achieve high corrosion resistance and wear resistance, good dispersibility, and reduce the effect of inclusions

Active Publication Date: 2018-08-10
GUANGZHOU ULTRA UNION CHEM LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The marine structural steel prepared by this invention has strong corrosion and fatigue resistance and is convenient for wide application in marine engineering. However, the coating prepared by this method will produce a typical "hoarfrost" problem caused by zinc during use, which limits its application.

Method used

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  • Preparation method of metal surface plating layer structure applicable to ocean severe corrosion environment
  • Preparation method of metal surface plating layer structure applicable to ocean severe corrosion environment
  • Preparation method of metal surface plating layer structure applicable to ocean severe corrosion environment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The preparation method of embodiment 1 iron and steel substrate coating structure

[0051] Such as figure 1 As shown, a metal surface coating structure suitable for marine strong corrosion environment, from inside to outside is 1-steel base layer, 2-cadmium plating layer, 3-passivation layer, 4-sealing layer.

[0052] Preparation:

[0053] S1. Metal substrate pre-treatment: Alkaline chemical degreasing → water washing → alkaline anode electrolytic degreasing → water washing → pickling → water washing → cathodic electrolytic degreasing → water washing → 10% sulfuric acid activation → water washing on the metal substrate. After the metal substrate;

[0054] S2. Preparation of cyanide-free cadmium plating layer: the metal substrate obtained in step S1 is prepared by using the acidic cyanide-free cadmium plating solution described in the Chinese invention application CN1062 45071A through the electroplating process to prepare a cyanide-free cadmium plating layer with a ...

Embodiment 2

[0057] The preparation method of embodiment 2 copper alloy substrate coating structure

[0058] Such as figure 2 As shown, a metal surface coating structure suitable for marine strong corrosion environment, from the inside to the outside is 21-copper alloy base layer, 22-cadmium plating layer, 23-passivation layer, 24-sealing layer.

[0059] Preparation:

[0060] S1. Metal substrate pretreatment: carry out alkaline chemical degreasing → water washing → ultrasonic chemical degreasing → water washing → pickling → water washing → 10% sulfuric acid activation → water washing on the metal substrate to obtain the treated metal substrate;

[0061] S2. Preparation of cyanide-free cadmium plating layer: the metal substrate obtained in step S1 is prepared by using the acidic cyanide-free cadmium plating solution described in the Chinese invention application CN1062 45071A through the electroplating process to prepare a cyanide-free cadmium plating layer with a thickness of 16 μm to ...

Embodiment 3

[0064] The preparation method of embodiment 3 zinc alloy coating structure

[0065] Such as image 3 As shown, a metal surface coating structure suitable for marine strong corrosion environment, from the inside to the outside is 31-zinc alloy base layer, 32-chemical pre-plating nickel layer, 33-cadmium plating layer, 34-passivation layer , 35-closed layer.

[0066] Preparation:

[0067] S1. Metal substrate pretreatment: carry out alkaline chemical degreasing → water washing → ultrasonic chemical degreasing → water washing → 5% nitric acid light → water washing → 5% sulfuric acid activation → water washing on the metal substrate to obtain the treated metal substrate. The treated metal substrate is plated with an electroless pre-nickel layer by an alkaline electroless nickel plating process, washed with water, and the plated part A is obtained;

[0068] S2. Preparation of cyanide-free cadmium plating layer: the plated part A obtained in step S1 is prepared by using the acid...

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Abstract

The invention belongs to the field of electroplating, and particularly relates to a preparation method of a metal surface plating layer structure applicable to an ocean severe corrosion environment. The preparation method of the metal surface plating layer structure applicable to the ocean severe corrosion environment comprises the following steps of S1, pretreating a metal matrix; S2, preparing anon-cyanide cadmium plating layer; S3, preparing a rare-earth modified chromate low-chromium passivation layer; and S4, preparing a hydroxyl graphene modified confining bed. The plating layer prepared through the method provided by the invention is good in corrosion resistance, capable of remarkably prolonging the service life of the metal matrix, and suitable for the ocean severe corrosion environment.

Description

technical field [0001] The invention belongs to the field of electroplating, and in particular relates to a method for preparing a metal surface coating structure suitable for marine strong corrosion environments. Background technique [0002] Ocean corrosion is one of the threats faced in the process of ocean development. There are many cases of catastrophic accidents caused by marine corrosion, resulting in extremely huge losses. In 1980, the welds on the pile legs of the "Alexander Kiddingde" drilling platform in the North Sea of ​​the United Kingdom were corroded by seawater, and the cracks continued to expand under repeated wave loads, resulting in dumping and 123 deaths; in 2010, British Petroleum Corporation in the Gulf of Mexico The failure of the submarine valve of the "Deepwater Horizon" drilling platform led to an explosion, killing 11 people. In the following three months, the seabed crude oil continued to gush out, with an overflow of more than 4 million barrel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D3/26C25D5/48C23C22/30C23C22/83C25D5/12
CPCC23C22/30C23C22/83C25D3/26C25D5/12C25D5/48
Inventor 郭崇武李小花赖奂汶
Owner GUANGZHOU ULTRA UNION CHEM LTD
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