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Stainless steel acid-washing substituting agent and preparation method thereof

A substitute, stainless steel technology, applied in the field of metal pickling substitutes, can solve the problems of insignificant fog suppression effect and easy rupture of the foam layer, and achieve the effect of inhibiting the escape of acid fog, reducing the corrosion rate and improving the production environment

Inactive Publication Date: 2013-04-17
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the stainless steel adopts high-concentration nitric acid mixed acid pickling process, the acid mist fogging speed is fast and NO x The concentration is high. From the perspective of application effect, traditional acid mist inhibitors need dozens of minutes of foaming time. Too long foaming time makes the fog suppression effect not obvious, and the foam layer is easy to break

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1: at 1m 3 In the pickling tank, add 640L of water in advance, and then add 160L of nitric acid solution with a concentration of 60%; 1.0kg of higher fatty alcohol polyoxyethylene ether, the carbon number of the alkyl group is 10-12, and the addition number of ethylene oxide is 5; Lauryl sulfate 1.0kg; Ethylenediamine 2.0kg; Sodium bifluoride 50kg. After the above-mentioned agents are evenly mixed, the temperature of the pickling liquid is added to 40-80 o C, the stainless steel pickling substitute can be obtained, and then put into untreated stainless steel pipe fittings. After 2 minutes, the surface of the pickling liquid can form a 2.2cm thick foam layer, no obvious acid mist is produced, pickling for 5 to 10 minutes Afterwards, the surface of the stainless steel is cleaned and cleaned, and a silver-white matte structure can be formed.

Embodiment 2

[0017] Example 2: at 1m 3 In the pickling tank, add 600L of water in advance, and then add 250L of nitric acid solution with a concentration of 60%; 2kg of higher fatty alcohol polyoxyethylene ether, the carbon number of the alkyl group is 16-18, and the addition number of ethylene oxide is 8; Fatty amine polyoxyethylene ether 2kg, alkyl carbon number 18, ethylene oxide addition number 18; sodium octadecylsulfonate 6kg; urea 2.0kg; ammonium bifluoride 80kg. After the above-mentioned agents are evenly mixed, the temperature of the pickling liquid is added to 40-80 o C, the stainless steel pickling substitute agent can be obtained, and then put into untreated stainless steel pipe fittings. After 2 minutes, the surface of the pickling liquid can form a fine foam layer with a thickness of 2.1cm. No obvious acid mist is seen. After 10 minutes, take out the stainless steel surface and clean it, and a silver-white matte structure can be formed.

Embodiment 3

[0018] Example 3: at 1m 3 In the pickling tank, add 600L of water in advance, and then add 200L of nitric acid solution with a concentration of 60%; 3.2kg of higher fatty alcohol polyoxyethylene ether, the carbon number of the alkyl group is 24-26, and the addition number of ethylene oxide is 20; Sodium octaalkylbenzenesulfonate 3kg; Propylenediamine 2.4kg; Potassium difluoride 100kg. After the above-mentioned agents are evenly mixed, the temperature of the pickling liquid is added to 40-80 o C, the stainless steel pickling substitute can be obtained, and then put into untreated stainless steel pipe fittings. After 2 minutes, the surface of the pickling liquid can form a foam layer with a thickness of 1.8cm. No obvious acid mist is produced. Pickling for 5 to 10 minutes Afterwards, the surface of the stainless steel is cleaned and cleaned, and a silver-white matte structure can be formed.

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Abstract

The invention discloses a stainless steel acid-washing acid mist inhibitor and a preparation method thereof. The stainless steel acid-washing acid mist inhibitor comprises the following components in percentage by weight: 0.2 to 1.0 percent of non-ionic surfactant, 0.1 to 0.3 percent of anionic surfactant, 0.5 to 1.0 percent of foam stabilizer and the balance of water. The non-ionic surfactant is one or more of higher fatty alcohol polyoxyethylene ether, higher fatty acid polyoxyethylene ether and higher fatty amine polyoxyethylene ether, wherein the number of alkyl carbon is 10 to 26; and the addition number of ethylene oxide is 5 to 20. The anionic surfactant is long chain alkyl sodium sulfonate, long chain alkyl sulfate or long chain alkyl sodium benzenesulfonate, wherein the number of alkyl carbon is 8 to 18. The foam stabilizer is low-carbon fatty amine or inorganic ammonium salt. The stainless steel acid-washing acid mist inhibitor has the characteristics of simple components, no organic solvent and the like, has high film-forming speed, high and stable film-forming thickness and high acid mist inhibition efficiency, and has obvious acid mist inhibition effect particularly under the condition of high nitric acid concentration when stainless steel is mixed with acid to perform acid washing.

Description

technical field [0001] The invention relates to a metal pickling substitute, in particular to a stainless steel pickling substitute and a preparation method thereof. Background technique [0002] When stainless steel is hot-rolled from billets to various plates and profiles, the surface will be oxidized by oxygen in the air, resulting in black and yellow tight oxide layers. In order to improve the appearance and corrosion resistance of stainless steel, the processed stainless steel must be pickled . In stainless steel (special steel) pickling lines, mixed acid (HNO 3 +HF) pickling process, HNO 3 It plays a major role in the mixed acid pickling process. It can not only dissolve iron and chromium oxides, but also effectively improve the surface quality of stainless steel after pickling. HF also plays an important role, F ions can convert excess Fe 3+ 、Ni 2+ 、Cr 3+ Combined into complex fluorine coordination compounds to reduce free Fe in solution 3+ 、Ni 2+ 、Cr 3+ The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23G1/08
Inventor 雷乐成朱京科杨彬李中坚
Owner ZHEJIANG UNIV
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