A protection method for corroded autoclave body

A technology of autoclave and sealing primer, which is applied in the direction of anti-corrosion coatings, coatings, epoxy resin coatings, etc., can solve problems such as shortened service life, and achieve the effects of avoiding potential safety hazards, saving repair time, and prolonging equipment life

Inactive Publication Date: 2019-01-15
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The process of the invention solves the problem in the prior art that the service life of the autoclave is shortened due to the corrosion of the autoclave body due to the substances released during the curing process of phosphogypsum standard bricks, but there are no effective measures to make up for it

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] A protection method for a corroded autoclave body is divided into the following three processing steps:

[0042] 1) Inner wall treatment: the inner wall of the corroded autoclave body is cleaned twice by alkali with a concentration of 32%, mechanically polished and derusted to St3 grade, and wiped 5 times;

[0043] 2) Brushing the primer: at a temperature of 24°C, paint 3 layers of sealing primer with a concentration of 25% on the inner wall of the autoclave body treated in step 1);

[0044] 3) Welding of stainless steel plates: After the sealing primer is cured for 1.5 days, the arc-shaped stainless steel plates that have been treated with anticorrosion are tailored and welded in the autoclave body.

[0045] The alkali in the step 1) is ammonia water.

[0046] Wiping in the step 1) is to wipe the inner wall of the corroded autoclave body with a cleaning agent with a concentration of 17%.

[0047] The cleaning agent is a mixture of trichlorethylene and toluene.

[00...

Embodiment 2

[0063] A protection method for a corroded autoclave body is divided into the following three processing steps:

[0064] 1) Inner wall treatment: the inner wall of the corroded autoclave body is cleaned once by alkali with a concentration of 43%, sand blasted and derusted to Sa3 level, and wiped four times;

[0065] 2) Brushing the primer: at a temperature of 38°C, paint a layer of sealing primer with a concentration of 25% on the inner wall of the autoclave body treated in step 1);

[0066] 3) Welding stainless steel plate: After the sealing primer is cured for 5 days, the arc-shaped stainless steel plate that has been treated with anticorrosion is tailored and welded in the autoclave body.

[0067] The alkali in the step 1) is a mixture of sodium hydroxide and ammonium bicarbonate.

[0068] The alkali mixture is mixed according to the weight ratio of sodium hydroxide and ammonium bicarbonate being 1:2.

[0069] Wiping in the step 1) is to wipe the inner wall of the corroded...

Embodiment 3

[0085] A protection method for a corroded autoclave body is divided into the following three processing steps:

[0086] 1) Inner wall treatment: the inner wall of the corroded autoclave body is cleaned twice with a concentration of 25% alkali, mechanically polished and derusted to St3 level, and wiped four times;

[0087] 2) Brushing the primer: at a temperature of 30° C., paint 3 layers of sealing primer with a concentration of 35% on the inner wall of the autoclave body treated in step 1);

[0088] 3) Welding of stainless steel plates: After the sealing primer is cured for 2 days, the arc-shaped stainless steel plates treated with anticorrosion are tailored and welded in the autoclave body.

[0089] The alkali in the step 1) is a mixture of sodium bicarbonate, ammonia water and ammonium bicarbonate.

[0090] The alkali mixture is mixed according to the ratio of sodium bicarbonate, ammonia water, and ammonium bicarbonate in parts by weight of 1:1:4.

[0091] Wiping in the s...

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Abstract

The invention relates to the field of corrosion and protection methods, in particular to a protection method for a corroded still kettle and a protection method for a still kettle corroded by substances released in the maintenance process of ardealite standard bricks. The protection method comprises the steps that alkali washing is carried out on the inner wall of the still kettle 1-6 times; mechanical grinding is adopted for derusting to the St3 level or derusting by sandblast is adopted to the Sa3 level; the inner wall is wiped with a cleaning agent 2-5 times; the treated inner wall of the kettle is brushed with 1-3 layers of epoxy seal primer; and after the epoxy seal primer is cured for 1-7days, a layer of stainless steel sheet is fully welded to the inner wall of the kettle. The next procedure can be executed after each procedure passes inspection. Corroded kettle equipment is repaired through the treatment, and meanwhile the protection method can be used for protection of the inner wall of new kettle equipment and has the beneficial effects of prolonging the service life and being resistant to corrosion.

Description

technical field [0001] The invention relates to the field of autoclave body protection, in particular to a method for protecting a corroded autoclave body. Background technique [0002] Corrosion science is an emerging marginal subject. During corrosion, a chemical or electrochemical multiphase reaction occurs on the interface of the metal, which turns the metal into an oxidized (ion) state, which significantly reduces the strength, plasticity, and toughness of the metal material. And other mechanical properties, and then destroy the geometric shape of metal components, and then increase the wear between parts, and deteriorate the physical properties of electricity and optics, so the service life of the equipment is reduced, and even catastrophic accidents such as fire and explosion are caused. According to incomplete statistics from developed countries, the annual direct loss due to corrosion accounts for about 1-4% of the gross national value, and the steel loss due to met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23F15/00C09D163/00C09D5/10C09D5/08
Inventor 陈勇郑全武杨浒陈双龙王巍肖开睿
Owner GUIZHOU KAILIN GRP CO LTD
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