Method of removing oxidized skin on hot rolling nickel stainless steel material

A technology of stainless steel and oxide skin, applied in chemical instruments and methods, cleaning methods using liquids, cleaning methods and utensils, etc., can solve problems such as surface water pollution, achieve low production costs, reduce environmental pollution, and be easy to separate.

Inactive Publication Date: 2006-01-11
TAIYUAN BETTER BIOCHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is impossible to separate the fluoride and nitrate in the waste pick

Method used

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Examples

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Example Embodiment

[0014] Example 1. 10% H in 1 liter 2 SO 4 Dissolve 5 grams of sodium sulfite in the aqueous solution. Each cleaning material is 100 grams of Ni304 bar.

[0015] Pickling liquid temperature (℃) 5 20 40 60 80 95

[0016] Material soaking time (min) 180 60 35 10 6 4

[0017] Ultrasonic treatment time (sec) 80 70 50 30 5 5

[0018] Processing steps:

[0019] (1) Immerse the cleaning material in the pickling solution, the temperature of the pickling solution and the soaking time of the material are listed in the table above;

[0020] (2) Take the cleaning material out of the pickling solution, and then put it in the water for ultrasonic treatment with an ultrasonic generator. The ultrasonic treatment time is as listed in the above table. Treatment result: all the oxide scales on the surface of the material fell off.

[0021] The ultrasonic generator used is the HYT mini ultrasonic cleaner produced by Xiamen Huayitong Machinery Equipment Co., Ltd., with an ultrasonic power of 300W and a...

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Abstract

A process for removing the oxidized surface layer from the hot-rolled Ni-contained stainless steel includes such steps as preparing acid washing liquid from sulfuric acid or hydrochloric acid, inorganic S compound and water proportionally, immersing said stainless steel in it at 5-95 deg.C for 4-180 min, and ultrasonic cleaning in water.

Description

technical field [0001] The invention relates to chemical cleaning of metal surfaces, in particular to a method for removing scales of hot-rolled nickel stainless steel rods and plates. Background technique [0002] High-temperature hot-rolled nickel stainless steel rods and plates are covered with a layer of dense structure and solid combination with the matrix, and the molecular formula is NiO Fe 2 o 3 A black oxide scale in the form of a nickel spinel structure, which is insoluble in acid. In order to remove this scale, the technologies adopted by stainless steel production enterprises at home and abroad are divided into two types, one is electrolytic pickling after shot blasting and then mixed acid pickling, and the other is high-temperature molten salt alkali leaching and then implementation Mix acid pickling. [0003] There have been many patents published around the technical research on stainless steel oxide scale removal. According to the composition of the pickli...

Claims

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Application Information

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IPC IPC(8): C23G1/08B08B3/12B21B45/00
Inventor 何明威潘继刚李文娟黄月君
Owner TAIYUAN BETTER BIOCHEM TECH
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