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Pickling agent for stainless steel

A pickling agent, stainless steel technology, applied in the field of chemical pickling agent for removing iron oxide scale on stainless steel surface, can solve the problems of long time for pickling stainless steel iron oxide scale, poor surface quality, low pickling efficiency, etc., so as to shorten the pickling time Time, improved pickling efficiency and strong cleaning ability

Inactive Publication Date: 2012-10-10
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of long pickling time, low pickling efficiency and poor surface quality after pickling of existing stainless steel iron oxide scales, the present invention provides a stainless steel washing machine with high pickling efficiency and no iron oxide scale residue on the stainless steel surface after pickling. pickling agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1 The application of this pickling solution in the pickling of 904L medium and thick plates in large-scale production.

[0024] In the pickling tank with a length of 9.1m, a width of 2.65m and a depth of 3.2m, according to the mass percentage:

[0025] Sulfuric acid 28%; Nitric acid 5%; Hydrochloric acid 10%; Hexamethylenetetramine 0.15%;

[0026] Sodium lauryl sulfate 0.1%; ethyl octylphenol polyoxyethylene (10 ether) 0.08%; the rest is water.

[0027] The mass concentration of acid used is respectively:

[0028] Sulfuric acid 96.0%; Nitric acid 66.0%; Hydrochloric acid 37.0%

[0029] Prepared 62m 3 Pickling solution. Slowly heat the pickling solution to 65°C, then hoist the pickling basket containing the 904L medium plate (thickness 10mm) after heat treatment and shot peening into the pickling tank for 8 minutes, and after the pickling basket is lifted out, the surface of the steel plate is cleaned with high pressure Rinse well with water. The oxide ski...

Embodiment 2

[0030] Example 2 The application of this pickling solution in the pickling of 2205 duplex stainless steel in large-scale production

[0031] In the pickling tank with a length of 9.1m, a width of 2.65m and a depth of 3.2m, according to the mass percentage:

[0032] Sulfuric acid 30%; Nitric acid 5%; Hydrochloric acid 12%; Hexamethylenetetramine 0.2%;

[0033] Sodium lauryl sulfate 0.1%; Ethyl octylphenol polyoxyethylene (10 ether) 0.1%; The rest is water.

[0034] The mass concentration of acid used is respectively:

[0035] Sulfuric acid 96.0%; Nitric acid 66.0%; Hydrochloric acid 37.0%

[0036] Prepared 60m 3 Pickling solution. Slowly heat the pickling solution to 80°C, then hang the pickling basket containing the 2205 duplex stainless steel plate (thickness 8mm) after heat treatment and shot peening into the pickling tank for 12 minutes, lift out the pickling basket and put the steel plate Surfaces are rinsed clean with high pressure water. The oxide skin on the surf...

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PUM

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Abstract

The invention relates to a pickling agent for stainless steel. According to percentage by weight, the pickling agent consists of the following components: 23 to 30 percent of sulfuric acid; 4 to 6 percent of nitric acid; 7 to 14 percent of hydrochloric acid; 0.1 to 0.3 percent of corrosion inhibitor; 0.13 to 0.25 percent of additive; and the balance of water. The mass concentrations of the used acids are as follows: 95.0 to 98.0 percent of sulfuric acid; 65.0 to 68.0 percent of nitric acid; and 36.0 to 38.0 percent of hydrochloric acid. The components are uniformly mixed according to proportion. The corrosion inhibitor is hexamethylene tetramine, the additive is the mixture of sodium dodecyl sulfate and isooctyl phenol polyoxyethylene, the percentage by weight of the sodium dodecyl sulfate is 0.08 to 0.15 percent, the percentage by weight of the isooctyl phenol polyoxyethylene is 0.05 to 0.1 percent, and the effect is better when the temperature of each acid is 60 DEG C to 80 DEG C. The pickling efficiency of the pickling agent for stainless steel is increased by four to five times, the pickled surface is bright and clean, and the pickling agent for stainless steel is particularly suitable for pickling the surfaces of stainless steel with high Cr, Ni and Mo alloy contents to remove ferric oxide scales.

Description

technical field [0001] The invention relates to a pickling agent for stainless steel, in particular to a chemical pickling agent for removing iron oxide scale on the surface of stainless steel with relatively high content of Cr, Ni and Mo alloys. Background technique [0002] Corrosion-resistant stainless steel such as super austenitic 904L and 2205 duplex stainless steel, the content of chromium, nickel and molybdenum alloy elements is 19.00-23.00%, 4.00-26.00 and 3.00-5.00%, and some also contain 1.00-2.00%. Copper and low carbon content, it has very good corrosion resistance, and the corrosion resistance characteristics are highlighted in the following aspects: (1) excellent general corrosion resistance in phosphoric acid and sulfuric acid environments; (2) good corrosion resistance The performance of pitting corrosion and crevice corrosion; (3) Compared with 18-8 or 18-8-Mo stainless steel, it has better resistance to stress corrosion cracking; (4) good resistance to int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08C23G1/06
Inventor 秦丽雁任维萍范光伟张寿禄郭保兵张威
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD
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