Stainless steel surface scale removal method and pickling solution adopted by same

A surface oxidation and stainless steel technology, which is applied in the fields of pickling solution and stainless steel surface scale removal, can solve the problems of fluorine-containing compounds environmental pollution, poor effect, water pollution, etc., achieve smooth stainless steel surface, prevent over-corrosion, and simplify processing The effect of craft

Inactive Publication Date: 2015-06-24
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, phosphorus-containing compounds can cause water pollution, causing red tides and other pollution phenomena, and fluorine-containing compounds also have certain pollution to the environment
Sulfuric acid is an environmentally friendly acid cleaning agent, but its effect is not good when used alone

Method used

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  • Stainless steel surface scale removal method and pickling solution adopted by same
  • Stainless steel surface scale removal method and pickling solution adopted by same
  • Stainless steel surface scale removal method and pickling solution adopted by same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0024] The stainless steel surface scale removal method of the present embodiment is as follows:

[0025] Put the stainless steel parts into the pickling solution at room temperature (15-25 °C, the same below) for 30 minutes to remove the scale on the stainless steel surface, then take out the stainless steel parts and put them in deionized water for ultrasonic cleaning for 15 minutes, and finally Stainless steel parts can be taken out and dried with hot air.

[0026] The pickling liquid of the present embodiment is the aqueous solution that is made up of the component of following concentration: dilute sulfuric acid 200mL / L, oxalic acid 3g / L, coconut oil fatty acid 3g / L, sodium hexametaphosphate 3g / L, urotropine 3g / L. The concentration of dilute sulfuric acid is 30wt%.

[0027] The metallographic microscope photograph of the stainless steel surface after the present embodiment is processed sees figure 1 .

Embodiment 2～ Embodiment 3）

[0029] Each embodiment is basically the same as Embodiment 1, and the differences are shown in Table 1. The metallographic microscope photographs of the stainless steel surface after each embodiment process are shown in respectively figure 2 and image 3 .

[0030] auxiliary acid Surfactant Example 1 3g / L oxalic acid 3g / L coconut oil fatty acid Example 2 3g / L citric acid 3g / L nonylphenol polyoxyethylene ether Example 3 3g / L phytic acid 1.5g / L coconut oil fatty acid + 1.5g / L nonylphenol polyoxyethylene ether

[0031] Depend on Figure 1 ~ Figure 3 It can be seen that the surface effect of the stainless steel treated by the method of Example 3 is the best.

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Abstract

The invention discloses a stainless steel surface scale removal method and a pickling solution adopted by the same. The pickling solution is a water solution composed of 100-300 ml / L dilute sulfuric acid, 1-5 g / L auxiliary acid, 1-5 g / L surfactant, 1-5 g / L brightening agent and 1-5 g / L corrosion inhibitor. The auxiliary acid is one of citric acid, oxalic acid, nicotinic acid and phytic acid. The surfactant is coconut oil fatty acid and / or nonylphenol polyethenoxy ether. The brightening agent is sodium hexametaphosphate or ethylenediamine tetraacetic acid. The corrosion inhibitor is one of sulfosalicylic acid, thiocarbamide, urotropine and urea. The pickling solution is environment-friendly, can prevent the stainless steel base from over corrosion, and especially can simultaneously remove grease on the stainless steel surface.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, and in particular relates to a method for removing scale on the surface of stainless steel and a pickling solution used therefor. Background technique [0002] Due to its excellent corrosion resistance, stainless steel has been widely used in industrial production and daily life. However, during the forming process of stainless steel, it is inevitable to go through different heat treatment processes, such as annealing, quenching, welding, forging, etc., which will cause a layer of black oxide scale on the surface of stainless steel. The existence of oxide skin not only affects the appearance quality of stainless steel, but also affects the subsequent processing of stainless steel, so it must be removed before subsequent processing, which is very important for keeping the surface of stainless steel clean and prolonging the service life of parts. significance. [0003] Traditional...

Claims

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Application Information

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IPC IPC(8): C23G1/08C23G1/06
Inventor 马迪李树白徐龙贵虞凌玮
Owner JIANGSU UNIV OF TECH
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