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A kind of preparation method of zinc-doped aluminum coating on stainless steel surface

A zinc-doped, stainless steel technology, applied in coatings, metal material coating processes, etc., can solve the problems of low preparation cost, difficult aluminizing process, and high preparation efficiency, avoid particle agglomeration, and solve the difficulty of aluminizing process. Great, reduce the effect of aluminizing temperature

Active Publication Date: 2020-10-02
NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the stainless steel with the zinc-doped aluminum paste coating layer formed on the surface is preheated and then alloyed by direct current heating, and a uniform and dense zinc-doped aluminum coating is formed on the surface of the stainless steel, which improves the resistance of the stainless steel. Corrosion performance, and solve the problem that the existing large and complex stainless steel components are difficult in the aluminizing process, the preparation cost is low and the preparation efficiency is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The preparation method of the present embodiment comprises the following steps:

[0022] Step 1. Preparation of zinc-doped aluminum slurry: Add 2.3g of polyvinyl butyral to 46.2g of absolute ethanol and mix well, then add 49g of -300 mesh aluminum powder, 2.0g of zinc chloride and 0.5g Silica gel and stir to mix evenly to obtain zinc-doped aluminum paste;

[0023] Step 2, stainless steel surface treatment: sandblasting and derusting the stainless steel surface, and then performing cleaning treatment; the stainless steel is heat-resistant steel G115 (9Cr-2.8W-3CoCuVNbBN), and the size of the stainless steel is 100mm×20mm×20mm;

[0024] Step 3, coating zinc-doped aluminum slurry: coating the zinc-doped aluminum slurry obtained in step 1 on the cleaned stainless steel surface in step 2, and then drying at room temperature to form zinc-doped aluminum slurry Aluminum paste coating layer; the zinc-doped aluminum paste coating layer has a thickness of 500 μm to 600 μm;

[00...

Embodiment 2

[0027] The preparation method of the present embodiment comprises the following steps:

[0028] Step 1. Preparation of zinc-doped aluminum slurry: Add 1.5g of polyvinyl butyral to 46.7g of absolute ethanol and mix well, then add 48.2g of -300 mesh aluminum powder, 3.0g of zinc chloride and 0.6 g silica gel and stir and mix uniformly to obtain zinc-doped aluminum slurry;

[0029] Step 2, stainless steel surface treatment: sandblasting and derusting the stainless steel surface, and then performing cleaning treatment; the stainless steel is heat-resistant steel G115 (9Cr-2.8W-3CoCuVNbBN), and the size of the stainless steel is 100mm×20mm×20mm;

[0030] Step 3, coating zinc-doped aluminum slurry: coating the zinc-doped aluminum slurry obtained in step 1 on the cleaned stainless steel surface in step 2, and then drying at room temperature to form zinc-doped aluminum slurry Aluminum paste coating layer; the zinc-doped aluminum paste coating layer has a thickness of 500 μm to 700 μm...

Embodiment 3

[0033] The preparation method of the present embodiment comprises the following steps:

[0034] Step 1. Preparation of zinc-doped aluminum slurry: Add 0.6g of hydroxyethyl cellulose to 48.9g of absolute ethanol and mix well, then add 46.4g of -300 mesh aluminum powder, 3.6g of zinc chloride and 0.5g of Silica gel and stir to mix evenly to obtain zinc-doped aluminum paste;

[0035] Step 2, stainless steel surface treatment: sandblasting and derusting the stainless steel surface, and then performing cleaning treatment; the stainless steel is heat-resistant steel G115 (9Cr-2.8W-3CoCuVNbBN), and the size of the stainless steel is 100mm×20mm×20mm;

[0036] Step 3, coating zinc-doped aluminum slurry: coating the zinc-doped aluminum slurry obtained in step 1 on the cleaned stainless steel surface in step 2, and then drying at room temperature to form zinc-doped aluminum slurry Aluminum paste coating layer; the zinc-doped aluminum paste coating layer has a thickness of 700 μm to 800 ...

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Abstract

The invention discloses a preparation method of zinc doped aluminum coating on the surface of stainless steel. The preparation method comprises the following steps: 1, adding a dispersing agent in a solvent to mix uniformly, and then adding aluminite powder, zinc chloride and silica gel to uniformly mix so as to obtain zinc doped aluminum slurry; 2, sequentially carrying out derusting by sandblastand cleaning on the surface of the stainless steel; 3, coating the cleaned surface of the stainless steel with the zinc doped aluminum slurry, and then airing to form a zinc doped aluminum slurry coating on the surface of the stainless steel; and 4, preheating the stainless steel with the zinc doped aluminum slurry coating formed on the surface, and then electrifying the stainless steel with direct current to heat the stainless steel for alloying treatment to form the zinc doped aluminum coating on the surface of stainless steel. With adoption of the preparation method, the stainless steel with the zinc doped aluminum slurry coating formed on the surface is first preheated and then is electrified with direct current to heat for alloying treatment to form the zinc doped aluminum coating with uniformity and high density on the surface of stainless steel, so that the corrosion resistance of the stainless steel is improved, the preparation cost is low and the preparation efficiency is high.

Description

technical field [0001] The invention belongs to the technical field of preparation of corrosion-resistant surface coatings, and in particular relates to a preparation method of zinc-doped aluminum coatings on stainless steel surfaces. Background technique [0002] The installed capacity of supercritical units in my country and the production technology of supercritical units have reached the top level in the world. my country plans to develop ultra-supercritical power generation technology with a main steam temperature of 650°C and above in the future. Higher main steam temperature is more corrosive to the stainless steel of the ultra-supercritical unit boiler, especially the growth rate and shedding rate of the oxide film on the high-temperature heating surface are significantly increased. put forward stricter requirements. Therefore, improving the oxidation resistance of stainless steel used in boilers has become the key to the development of ultra-supercritical power gen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
CPCC23C24/106
Inventor 李广忠汪强兵李烨李亚宁杨保军康新婷荆鹏黄愿平
Owner NORTHWEST INSTITUTE FOR NON-FERROUS METAL RESEARCH
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