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Chemical process for removing oxidizing layer of stainless steel

A technology of chemical removal and oxide layer, applied in the field of chemical removal of stainless steel oxide layer, which can solve the problems of long processing time, high temperature of pickling solution and high energy consumption.

Inactive Publication Date: 2007-10-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Pickling treatment of hot-rolled 2205 duplex stainless steel oxide layer, the existing stainless steel oxide layer pickling method uses high temperature pickling solution, large energy consumption, long processing time, and high cost
Especially for 2205-phase stainless steel medium and thick plates with large areas, if the oxide layer produced by pickling and hot-rolling is carried out, there is no effective method
Chinese patents have disclosed some pickling methods for the oxide layer of stainless steel, but there is no pickling method for the oxide layer with a particularly complex structure produced during the hot rolling process of 2205 duplex stainless steel
The oxide layer formed during the hot rolling of this steel is rich in chromium, nickel, molybdenum, silicon and other components, and has a very complex structure, making the oxide layer very resistant to acid corrosion. It is difficult to remove by general stainless steel pickling methods, and These methods are not suitable for pickling in large production processes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment is the pickling of the oxide layer of 2205 phase stainless steel.

[0029] The 2205-phase stainless steel strip is immersed in a pickling tank with pickling solution, and the concentration of each substance in the pickling solution is:

[0030] Sulfuric acid 245g / L

[0031] Sodium sulfite 80g / L

[0032] Sodium chloride 50g / L

[0033] Sodium nitrate 22g / L

[0034] Sodium fluoborate 65g / L

[0035] Thiourea 6g / L

[0036] Oxalic acid 80g / L

[0037] water balance.

[0038] The temperature of the pickling solution is 65°C, and the 2205 duplex stainless steel strip is soaked in the pickling pool for 45 minutes.

Embodiment 2

[0040] This embodiment is the pickling of the oxide layer of 2205 duplex stainless steel.

[0041] The 2205 duplex stainless steel strip is immersed in a pickling tank with pickling solution. The concentration of each substance in the pickling solution is:

[0042] Sulfuric acid 260g / L

[0043] Sodium sulfite 100g / L

[0044] Sodium chloride 60g / L

[0045] Sodium nitrate 30g / L

[0046] Sodium fluoborate 80g / L

[0047] Thiourea 8g / L

[0048] Oxalic acid 100g / L

[0049] water balance.

[0050] The temperature of the pickling solution is 70°C, and the 2205 duplex stainless steel strip is soaked in the pickling pool for 48 minutes.

Embodiment 3

[0052] This embodiment is the pickling of the oxide layer of 2205 duplex stainless steel.

[0053] The 2205 duplex stainless steel strip is immersed in a pickling tank with pickling solution. The concentration of each substance in the pickling solution is:

[0054] Sulfuric acid 230g / L

[0055] Sodium sulfite 60g / L

[0056] Sodium chloride 40g / L

[0057] Sodium nitrate 15g / L

[0058] Sodium fluoborate 50g / L

[0059] Thiourea 4g / L

[0060] Oxalic acid 60g / L

[0061] water balance.

[0062] The temperature of the pickling solution is 50°C, and the 2205 duplex stainless steel strip is soaked in the pickling pool for 60 minutes.

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Abstract

This invention discloses a chemical method for removing stainless steel oxide layer. The method comprises: soaking 2205 bi-phase stainless steel belt in an acid-washing pool filled with acid-washing solution. The acid-washing solution comprises: sulfuric acid 230-260 g / L, sodium sulfite 60-100 g / L, sodium chloride 40-60 g / L, sodium nitrate 15-30 g / L, sodium borofluoride 50-80 g / L, thiourea 4-8 g / L, oxalic acid 60-100 g / L, and water as balance. The temperature of the acid-washing solution is 50-70 deg.C. The soaking time of 2205 bi-phase stainless steel belt in the acid-washing pool is 40-60 min. The acid-washing solution is stirrer by aeration during the acid washing process. The method is especially suitable for acid-washing 2205 bi-phase stainless steel belt.

Description

technical field [0001] The invention relates to a chemical removal method of stainless steel oxide layer. Background technique [0002] The hot-rolled 2205 duplex stainless steel oxide layer is pickled. The existing stainless steel oxide layer pickling method uses a pickling liquid with high temperature, high energy consumption, long processing time and high cost. Especially for 2205-phase stainless steel medium and thick plates with large areas, if the oxide layer produced by pickling and hot-rolling is carried out, there is no effective method. Chinese patents have disclosed some pickling methods for stainless steel oxide layers, but there is no pickling method for oxide layers with a particularly complex structure produced during hot rolling of 2205 duplex stainless steel. The oxide layer formed during the hot rolling of this steel is rich in chromium, nickel, molybdenum, silicon and other components, and has a very complex structure, which makes the oxide layer very res...

Claims

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Application Information

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IPC IPC(8): C23G1/04
Inventor 侯瑞鹏
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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