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Detergent for stainless steel and preparation method

A cleaning agent, stainless steel technology, applied in the field of pickling, can solve the problem of heating to 50-75 ℃, to achieve the effect of preventing corrosion and simple operation

Active Publication Date: 2005-11-16
CHINA ERZHONG GRP DEYANG HEAVY IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the "multifunctional stainless steel pickling agent" disclosed by Chinese patent (publication number 1090339A), the pickling solution prepared by using hydrochloric acid, nitric acid, sulfuric acid three mixed acids and the combination of LK type slow release agent has a sustained release rate of less than 60%, and needs to be heated to It can be used at 50~75℃, and it can only clean thin oxide scales, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Add 15Kg of ammonium persulfate, 120Kg of ferric chloride, 180Kg of butynediol, 16Kg of disodium edetate, and 22Kg of slow-release agent in 1000Kg of water, and stir while adding to make it fully dissolved; then add 65% w 500Kg of nitric acid per w, 400Kg of 34% hydrochloric acid, stir to get the required cleaning solution after mixing them evenly. Wherein the sustained release agent proportion is: sebacic acid triethanolamide 13.2Kg, Tween 6.6Kg, sodium tripolyphosphate 2.2K.

[0033] Wherein used nitric acid and hydrochloric acid also can be: the industrial nitric acid of 65~70%w / w, the industrial hydrochloric acid of 30~34%w / w, calculate its weight percent with the nitric acid of 65%w / w, the hydrochloric acid of 34% calculate. Raw materials used in this example: ammonium persulfate with purity ≥ 98% w / w, disodium edetate with purity ≥ 98% w / w, butynediol content and purity with purity ≥ 98% w / w Triethanolamide sebacate with a purity of ≥90% w / w, Tween with a purity...

Embodiment 2

[0036] Add 200Kg of ammonium persulfate, 550Kg of zinc chloride, 500Kg of butynediol, 400Kg of disodium edetate, and 50Kg of slow-release agent in 4000Kg of water, and stir while adding to make it fully dissolved. Then add 600Kg of 65%w / w nitric acid and 1000Kg of 34%w / w hydrochloric acid, stir until mixed evenly, and obtain the desired cleaning solution. Wherein the ratio of the sustained-release agent is: triethanolamide sebacic acid 35.5Kg, Tween 10.5Kg, sodium tripolyphosphate 4Kg.

[0037] Soak 4000Kg of 1Cr18Ni9Ti1 stainless steel pipe with more oxide layers on the surface weld seam and degreasing treatment in the cleaning solution for 2 to 5 minutes, take it out and rinse it in the clean water pool to remove the residual cleaning solution on the pipe wall, the weld seam and its surroundings The oxide layer is removed, and the steel pipes all present a bright white stainless steel luster. Each ton of cleaning solution can clean more than 20 tons of stainless steel pipes...

Embodiment 3

[0039]Add 160Kg of ammonium persulfate, 220Kg of ferric chloride, 218Kg of butynediol, 160Kg of disodium edetate, and 22Kg of sustained-release agent in 2700Kg of water, and stir while adding to make it fully dissolved. Then add 120Kg of 65%w / w nitric acid and 400Kg of 34%w / w hydrochloric acid, stir and mix evenly to obtain the cleaning solution. Wherein the sustained-release agent proportioning is: sebacic acid triethanolamide 17.6Kg, Tween 3.3Kg, sodium tripolyphosphate 1.1Kg.

[0040] Soak 3000Kg 3Cr13 stainless steel plate with 2mm thick oxide layer on the surface and degreasing treatment in the cleaning solution for 6 minutes, take it out and rinse it in the clean water pool to remove the remaining cleaning solution on the plate, and the oxide scale will be completely removed. The whole stainless steel plate presents a bright white stainless steel luster.

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Abstract

A detergent for stainless steel contains proportionally nitric acid, hydrochloric acid, ammonium persulfate, water-soluble chloride, catalyst, corrosion inhibitor (the composition of triethanolamide decanedionate, tween and sodium tripolyphosphate), and water.

Description

technical field [0001] The invention belongs to the pickling technology in machinery and metallurgy, in particular to a cleaning agent for stainless steel. Background technique [0002] As we all know, regardless of stainless steel pipes or plates, during heat treatment, hot rolling, welding and other processing, scale will be formed on the surface, which is not beautiful and hinders the next process, so it needs to be removed. [0003] For a long time, chemical methods have been widely used at home and abroad to remove scale on stainless steel surfaces. The cleaning agents used are basically hydrofluoric acid and nitric acid, such as Chinese patents CN89103222.3, CN93108942.5, and CN93111022.X. Hydrofluoric acid is not only highly toxic, but also easily volatile, which affects the health of operators and also causes damage and pollution to the environment. [0004] Now both at home and abroad are looking for a stainless steel surface scale cleaning agent to replace hydrofl...

Claims

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Application Information

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IPC IPC(8): C23G1/02
Inventor 白敏
Owner CHINA ERZHONG GRP DEYANG HEAVY IND
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