Pickling method of stainless steel covered by acid-proof cloth

A technology of stainless steel and pickling method, which is applied in the field of metal pickling and surface treatment, which can solve the problems of slow pickling speed, inability to remove, and high cost, and achieve the effects of avoiding environmental pollution, good pickling quality, and fast pickling speed

Inactive Publication Date: 2009-12-09
LUOYANG SHUANGRUI METAL COMPOSITE MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, this pickling method cannot control the acid concentration and temperature changes, and the pickling quality cannot be guaranteed.
Pickling is slow or even impossible in cold weather
In addition, in this pickling method, oxide film dissolution products, such as iron, nickel, chromium and other metal ions and carbon residues, are contained in the pickling paste and cannot be removed, which seriously affects the pickling speed and pickling quality.
Pickling paste is discarded after only one or two uses, which is costly and seriously pollutes the environment

Method used

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  • Pickling method of stainless steel covered by acid-proof cloth
  • Pickling method of stainless steel covered by acid-proof cloth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0020] Such as figure 1 As shown, put the stainless steel cladding of the composite plate facing upwards, and place it obliquely on the upper end of the solution recovery tank. On the surface of stainless steel that needs to be pickled, cover it with 3 layers of acid-resistant cloth, and spray pickling solution on the surface of the acid-resistant cloth every 5 to 10 minutes to keep the acid-resistant cloth moist. Excess pickling liquid flows into recovery tank. Roll the acid-resistant cloth with a plastic roller to drive away the air bubbles under the cloth. Pickling treatment. When the temperature is low, heat the pickling solution to 20-30°C in the acid storage tank, and spray the pickling solution on the surface of the acid-resistant cloth every 2-3 minutes to maintain the pickling temperature and concentration. If necessary, heat the acid-resistant cloth with hot air to maintain the pickling temperature. In hot weather, uncover the acid-resistant cloth on the thinner ...

Embodiment approach 2

[0022] Such as figure 2 As shown, put the stainless steel cladding of the composite plate facing upwards, and place it obliquely on the upper end of the solution recovery tank. On the stainless steel surface that needs to be pickled, cover 4 layers of acid-resistant cloth, and put a porous plastic pipe and an electric heater in an appropriate position between the two layers of cloth. Acid cleaning solution is supplied to acid-resistant cloth through acid-resistant pump and porous plastic pipe. When the temperature is low, heat the pickling solution to 20-30°C in the acid storage tank, and heat the pickling cloth with an electric heater. Control the concentration and temperature of the pickling solution within the optimum process range, uncover the pickling cloth at any time to check the pickling situation, and finally the pickling cloth and pickling solution are cleaned, filtered, etc., stored, and used many times.

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Abstract

The invention introduces a pickling method of stainless steel covered by acid-proof cloth; the method comprises the following steps: covering multi-layer acid-proof cloth on the surface of the stainless steel, supplying pickling solution on the surface of the acid-proof cloth and continuously updating, adding the updated original pickling solution into a solution recovery tank; ensuring that the concentration of the pickling solution is in the optimal process range through changing the concentration of the original pickling solution in the solution recovery tank and continuously updating the acid in the pickling cloth. the temperature of the pickling solution can also be ensured within the optimal process range by removing the bubbles under the cloth by the acid-proof tool and heating and controlling the pickling temperature to. The method can ensure the optimal pickling temperature and concentration, the pickling has good quality; the method can remove an oxidation film thoroughly without overpickling; after pickling, the steel plate has uniform color and metal gloss on the surface; the pickling cloth and pickling solution can be used repeatedly, the pickling cost is low; thus avoiding environmental pollution caused by the waste pickling paste.

Description

technical field [0001] The invention relates to a technology in the field of metal pickling and surface treatment, in particular to a stainless steel acid-resistant cloth-covered pickling method. Background technique [0002] In the production process of stainless steel clad plate, due to the need to go through processes such as explosive cladding, repair welding, leveling, and tempering heat treatment, a thick oxide scale is formed on the surface, not only the appearance is not good, but the local residual scale also affects the corrosion resistance of the clad plate properties, must be thoroughly removed by pickling. [0003] Deng Xianghuai, Sun Yongchun, Wang Huabei, etc. have invented patents with application numbers of CN86101522, CN94104920, and CN 200610000086 respectively, disclosing several stainless steel pickling pastes. These patents are all by brushing the pickling cream on the surface of the steel oxide film, relying on the acid in the pickling cream to dissol...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/02C23G1/08C23G1/36
CPCC23G1/08C23G1/36C23G3/00
Inventor 林百春辛宝
Owner LUOYANG SHUANGRUI METAL COMPOSITE MATERIAL
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