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Direct chromium stainless-steel pickling agent

A stainless steel and pickling agent technology, applied in the field of chromium stainless steel pickling agent, can solve the problems of complex treatment process, unreasonable pickling agent, poor surface quality, etc., and achieve the effect of simplified treatment process, excellent protection performance and high cost

Inactive Publication Date: 2009-11-04
李青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention provides a chromium stainless steel in order to solve the problems that the existing pickling agent for removing scale of chromium stainless steel is unreasonable, and therefore needs to be treated with an alkali bath before pickling, resulting in complicated treatment process and poor surface quality after pickling. direct pickling agent

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0009] The direct pickling agent for chromium stainless steel has the following components and weight ratio: 45% hydrochloric acid with a concentration of 30%, 51.2% hydrofluoric acid with a concentration of 55%, and 3.8% corrosion inhibitor. The corrosion inhibitor is hexamethylenetetraammonium.

[0010] Pickling object: hot-rolled seamless steel pipe, steel type 1Cr17Mo2Ti, specification φ80mm, annealed state.

[0011] Dilute the above components and proportioned pickling agent with water to a concentration of 30% (such as 30 kg of pickling agent plus 70 kg of water), heat to 60 ° C, soak the product for 120 minutes, remove and rinse with water. The oxide skin on the surface of the product is removed and the surface is smooth and white.

Embodiment 2

[0013] The direct pickling agent for chromium stainless steel has the following components and weight ratio: 70% hydrochloric acid with a concentration of 30%, 28.5% hydrofluoric acid with a concentration of 50%, and 1.5% corrosion inhibitor. The corrosion inhibitor is hexamethylenetetraammonium.

[0014] Pickling object: cold-rolled sheet, steel type 0Cr13, specification 1.0mm, annealed state.

[0015] Dilute the above components and proportioned pickling agent with water to a concentration of 25%, heat to 55°C, soak the product for 35 minutes, remove and rinse with water. The oxide skin on the surface of the product is removed and the surface is smooth and white.

Embodiment 3

[0017] The direct pickling agent for chromium stainless steel has the following components and weight ratio: 60% hydrochloric acid with a concentration of 30%, 37% hydrofluoric acid with a concentration of 50%, and 3% corrosion inhibitor. The corrosion inhibitor adopts LK type corrosion inhibitor.

[0018] Pickling object: hot-rolled wire rod, steel type 409L (containing trace nickel elements), specification φ10mm, annealed state.

[0019] Dilute the above components and proportioned pickling agent with water to a concentration of 20%, heat to 50°C, soak the product for 60 minutes, remove and rinse with water. The oxide skin on the surface of the product is removed and the surface is smooth and white.

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Abstract

The invention relates to a pickling agent for chromium stainless steel, in particular to a direct pickling agent for chromium stainless steel. The method solves the problems that the existing pickling agent for removing chromium stainless steel oxide scale is unreasonable, and thus pretreatment such as alkali bath is required before pickling, resulting in complicated treatment process and poor surface quality after pickling. The composition and weight ratio of the pickling agent are: 30%-80% hydrochloric acid with a concentration of 30%, 17.2%-69.7% hydrofluoric acid with a concentration of 50% or 55%, and 0.3%-3.8% corrosion inhibitor. The corrosion inhibitor can be hexamethylene tetraammonium or rhodin or LK type corrosion inhibitor. The prominent feature of the direct pickling agent for chromium stainless steel is that it can directly remove the scale of chromium stainless steel without pretreatment such as alkali bath, which simplifies the treatment process. Experiments have proved that the pickling agent has excellent protection performance on the surface of chromium stainless steel, and the pickling surface is smooth and white, which is similar to that of austenitic stainless steel. It is suitable for pickling of chromium stainless steel wire, bar, profile, pipe, plate, wire, etc. and mechanical parts in the state of heat processing and heat treatment.

Description

technical field [0001] The invention relates to a pickling agent for chromium stainless steel, in particular to a direct pickling agent for chromium stainless steel. Background technique [0002] Chromium stainless steels refer to ferritic and martensitic stainless steels. Chromium stainless steel forms a firm and dense oxide scale on the surface during the annealing process. The current process for removing scale (except for the continuous pickling process) is single-tank pickling by alkaline-acid method, that is, pickling with sulfuric acid after alkaline bath. There are many disadvantages in this process: the alkali bath is NaOH, NaNO at about 500°C 3 Soaking in the melt, and then quenching in water to loosen the scale. Alkaline bath will cause serious three wastes pollution, especially water explosion will produce a large amount of water vapor carrying NaOH, NaNO 3 Such harmful substances soar into the sky and fill the air, which not only causes waste, but also serio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23G1/04C23G1/06C23G1/08
Inventor 李青
Owner 李青
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