Stainless steel acid-washing acid mist inhibitor and preparation method thereof

An acid mist inhibitor, stainless steel technology, applied in the field of pickling acid mist inhibitor, can solve the problems of easy rupture of the foam layer and insignificant fog suppression effect.

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

[0014] Example 1: at 1m 3 Contains 20%HNO 3 +2%HF mixed acid pickling tank, add 2.0kg of higher fatty alcohol polyoxyethylene ether, alkyl carbon number is 10-12, ethylene oxide addition number is 5; lauryl sulfate 1.0kg; Diamine 5kg. Heat to 40~80 o C. Put untreated stainless steel pipe fittings in. After 2 minutes, the liquid surface forms a fine foam layer with a thickness of 2.2cm, and no obvious acid mist is produced.

Embodiment 2

[0015] Example 2: at 1m 3 Contains 15%HNO 3 +1%HF pickling tank, add 5kg of higher fatty alcohol polyoxyethylene ether, alkyl carbon number is 24~26, ethylene oxide addition number is 20; higher fatty amine polyoxyethylene ether 5kg, alkyl carbon number The number is 18, and the addition number of ethylene oxide is 18; sodium octadecylsulfonate 2kg; urea 4.0kg, ammonium chloride 6kg. Heat to 40~80 o C. Put untreated stainless steel pipe fittings in. After 2 minutes, the liquid surface forms a fine foam layer with a thickness of 2.1 cm, and no obvious acid mist is produced.

Embodiment 3

[0016] Example 3: at 1m 3 Contains 10%HNO 3 +15%HCl+5%H 2 SO 4 In the pickling tank, add 3kg of higher fatty alcohol polyoxyethylene ether, the carbon number of the alkyl group is 20-22, and the addition number of ethylene oxide is 20; 3kg of sodium octaalkylbenzenesulfonate; 5kg of propylenediamine. Heat to 40~80 o C. Put untreated stainless steel pipe fittings in. After 2 minutes, a foam layer with a thickness of 1.8cm was formed on the liquid surface, and no obvious acid mist was generated.

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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 pickling acid mist inhibitor, in particular to a stainless steel pickling acid mist inhibitor and a preparation method thereof. Background technique [0002] Pickling to remove rust or surface oxide layer is the most common process in metal processing, machining and manufacturing industries. In stainless steel (special steel) pickling lines, mixed acid (HNO 3 +HF) pickling process, nitric acid plays a major role in the mixed acid pickling process, not only can dissolve the oxides of iron and chromium, but also can effectively improve the surface quality of stainless steel after pickling, this process has the advantages of fast pickling speed and good effect Features. Due to the violent chemical reaction between metals and metal oxides and strong acids, a large amount of HF, H 2 and NO x Acid gas, the gas is carried in the process of rising and volatilizing to produce a large amount of acid aerosol pollutants, which is aci...

Claims

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Application Information

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