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Preparation method of metal-based long-acting anti-oxidation protective coating

A protective coating and anti-oxidation technology, which is applied in metal material coating process, coating, fusion spraying, etc., can solve the problems of thermal expansion coefficient difference, etc., achieve high-temperature mechanical properties improvement, increase working life, and reduce energy consumption Effect

Active Publication Date: 2012-09-26
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the difference in thermal expansion coefficient between stainless steel and carbon steel, heat conduction problems, welding and repair welding problems, and production costs, these methods have not been generally accepted by sponge titanium manufacturers.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach

[0023] The method is suitable for surface protection of large-scale high-temperature equipment such as low-carbon steel distillation reactors and annealing tanks. The specific process steps involved in the invention are as follows:

[0024] 1. First, use the sandblasting method to remove the scale on the outer surface of the sponge titanium distillation reactor or annealing tank, and roughen it to obtain a Sa 3.0-level sandblasting surface, which is a reliable combination of the coating and alloying elements during heating. Diffusion removes barriers.

[0025] 2. After sand blasting, arc spraying should be carried out as soon as possible, and a layer of nickel-based alloy or iron-based alloy with a primer alloy of 100-300 μm should be sprayed first. The composition range of the alloy wire is Cr 20-50%, Al 0-20%, Ti 0-8%, Mo 0-3%, Y 0-1%, and the rest is Ni or Fe, among which Y is a rare earth element. Chromium is the main anti-oxidation element, and their reasonable combinati...

Embodiment 1

[0031] Example 1: Firstly, the scale on the outer surface of the titanium sponge distillation reactor was removed by sandblasting to achieve a sandblasting surface of Sa 3.0. Immediately after grit blasting, the primer alloy is arc sprayed. The alloy uses a nickel-chromium alloy wire with a diameter of 2mm, and the composition is: Cr 45%, Ni balance. The spraying process parameters are: arc voltage 33V, working current 200A, distance between spray gun and workpiece 120mm, atomizing air pressure 0.5Mpa. The thickness of the bottom coating is about 100 μm. The surface alloy of arc spraying uses aluminum-silicon wire with a diameter of 2mm, the composition is: Si 6%, Al balance, the spraying process parameters are: arc voltage 31V, working current 150A, distance between spray gun and workpiece 150mm, atomization air pressure 0.6Mpa, the thickness range of the top coat is 800μm.

[0032] After spraying, use an electric wire brush to brush evenly on the surface until the surface...

Embodiment 2

[0034] Example 2: Firstly, the oxide skin on the outer surface of the titanium sponge distillation reactor was removed by sandblasting to achieve a sandblasting surface of Sa 3.0. Immediately after grit blasting, the primer alloy is arc sprayed. The alloy uses a nickel-chromium-titanium alloy wire with a diameter of 2mm, and the composition is: Cr 45%, Ti 4%, Ni balance. The spraying process parameters are: arc voltage 33V, working current 200A, distance between spray gun and workpiece 120mm, atomizing air pressure 0.5Mpa. The thickness of the bottom coating is about 300 μm. The surface alloy of arc spraying uses aluminum-silicon wire with a diameter of 2mm, the composition is: Si 9%, Al balance, the spraying process parameters are: arc voltage 31V, working current 150A, distance between spray gun and workpiece 150mm, atomization air pressure 0.6Mpa, the thickness range of the top coat is 600μm.

[0035] Apply permeation-promoting paint to the coating after spraying. The pe...

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Abstract

The invention belongs to the technical field of metal corrosion and protection, and particularly relates to a preparation method of an anti-oxidation and hot corrosion protective coating for the metal equipment and components serving under high-temperature conditions. The preparation method is characterized by comprising the following steps of: firstly performing sand blasting and roughening of the outer surface of a metal workpiece; spraying a layer of bottom alloy on the outer surface of the metal workpiece by an electric arc spraying method, and then spraying a layer of surface alloy again; and after the spraying, performing hole sealing of the coating surface to obtain a metal workpiece with a metal-based long-acting anti-oxidation protective coating. The invention aims to realize protection by use of the method; and through the invention, the service life of the large high-temperature equipment such as a distillation reactor, an annealing pot and the like made from low-carbon steel in high-temperature environment can be prolonged, and the production and using cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of metal corrosion and protection, and in particular relates to a method for preparing an oxidation-resistant and thermal-corrosion protective coating for metal equipment and components serving under high-temperature conditions. Background technique [0002] Steel material is the most cost-effective structural material widely used in the world. However, in a high-temperature oxidizing atmosphere, the surface oxidation of steel materials is extremely serious. High-temperature oxidation causes metal loss, reduces the effective bearing cross-section of equipment components, reduces the mechanical properties of materials, and seriously reduces the service life of equipment. Since steel materials are currently the cheapest metal materials available on the earth, even in high temperature environments, steel materials face serious oxidation problems, and in many industrial fields, steel is still the most widely us...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C4/08C23C4/18C23C4/073C23C4/131
Inventor 张忠礼李德元张义顺董晓强张楠楠
Owner SHENYANG POLYTECHNIC UNIV
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