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Tubular electric heating element tumbling technology capable of improving corrosion resistance of tubular electric heating element

A treatment process, electric heating tube technology, applied in metal material coating process, manufacturing tools, metal processing equipment, etc., can solve the problems of welding scale on the metal surface, easy to rust on the surface of electrothermal light, and can not be used, etc., to achieve a bright surface , Oxidation resistance improvement, the effect of prolonging the service life

Inactive Publication Date: 2014-11-19
JIANGSU SHUNFA ELECTRIC HEATING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electric heating tube is a workpiece that has been working in a high-temperature and high-humidity environment for a long time. There is welding scale on the metal surface during manufacture. If the surface is not cleaned, it can be directly rolled and plated.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1）

[0015] The specific steps of the electrothermal tube rolling treatment process of the present embodiment are as follows:

[0016] A. Treatment before rolling:

[0017] Put 50 pieces of electric heating tubes made by welding and forming process into 65°C white steel aqueous solution for 12 minutes, then soak them in concentrated nitric acid solution for 5 seconds, then rinse with clean water, and clean the surface. After treatment, the surface of the electric heating tube is white in appearance, and the welding scale can be brushed off with a toothbrush.

[0018] The white steel aqueous solution is made of 12% white steel and clean water in a mass ratio of 14:100. The composition of molten steel is 30wt% phosphoric acid, 10wt% nitric acid, 15wt% hydrochloric acid, and the rest is water. Concentrated nitric acid solution is prepared from 70% nitric acid and water in a mass ratio of 70:30.

[0019] B. Tumbler Treatment and Cleaning:

[0020] Put 400 pieces of electric heati...

Embodiment 2）

[0025] The specific steps of the electrothermal tube rolling treatment process of the present embodiment are as follows:

[0026] A. Treatment before rolling:

[0027] Put 50 pieces of electric heating tubes made by welding and forming process into the white steel aqueous solution at 50 ℃ for 6 minutes, then put them into the concentrated nitric acid solution for 5 seconds, then rinse with clean water, and clean the surface.

[0028] The white steel aqueous solution is made of white steel with a concentration of 12% and clean water in a mass ratio of 12:100. Concentrated nitric acid solution is prepared from 70% nitric acid and water at a mass ratio of 65:35.

[0029] B. Tumbler Treatment and Cleaning:

[0030] Put 400 pieces of electric heating tubes that have been treated before rolling into the rolling machine, add steel balls and clean water to completely cover the electric heating tubes. Add 160g of polishing agent and 80g of citric acid powder before tumbling, and t...

Embodiment 3）

[0035] The specific steps of the electrothermal tube rolling treatment process of the present embodiment are as follows:

[0036] A. Treatment before rolling:

[0037] Put 50 pieces of electric heating tubes made by welding and forming process into 80°C white steel aqueous solution for 8 minutes, then soak them in concentrated nitric acid solution for 5 seconds, then rinse with clean water, and clean the surface.

[0038] The white steel aqueous solution is made of 12% white steel and clean water in a mass ratio of 16:100. Concentrated nitric acid solution is prepared from 70% nitric acid and water in a mass ratio of 75:25.

[0039] B. Tumbler Treatment and Cleaning:

[0040] Put 400 pieces of electric heating tubes that have been treated before rolling into the rolling machine, add steel balls and clean water to completely cover the electric heating tubes. Add 200g of polishing agent and 120g of citric acid powder before tumbling, and tumbling for 18 minutes. When tumbli...

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PUM

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Abstract

The invention relates to a tubular electric heating element tumbling technology. The tubular electric heating element tumbling technology comprises the following steps that A, a tubular electric heating element is soaked in a stainless steel cleaning solution at the temperature of 65 DEG C for 12 minutes firstly, the tubular electric heating element is soaked in a concentrated nitric acid solution for five seconds secondly, the tubular electric heating element is flushed thirdly, and then the surface of the tubular electric heating element is cleaned; B, firstly, tumbling is conducted on the tubular electric heating element which has been handled before tumbling, secondly, the tubular electric heating element obtained after tumbling is soaked in a dilute citric acid solution which is at the temperature of 80 DEG C and has the concentration of 5% for five minutes, and then the tubular electric heating element is flushed; C, passivation treatment and spin-drying are conducted on the tubular electric heating element, wherein when passivation treatment is conducted, the tubular electric heating element is soaked in a dilute nitric acid solution for ten seconds and then are placed in a corrosion inhibition solution to be soaked for ten seconds, the tubular electric heating element is filtered and washed, and the corrosion inhibition solution comprises potassium iodide, benzotriazole and water at the mass ratio of 0.1:60:100. By the adoption of the tubular electric heating element tumbling technology, welding dirt, spots, stains and rust on the surface of the tubular electric heating element can be effectively removed, and therefore the plating quality of the tubular electric heating element is improved.

Description

[0001] This application is a divisional application, the application number of the original application: 201210481561.9, the application date: 2012-11-23, the name of the invention: electric heating tube rolling burnishing treatment process. technical field [0002] The invention relates to a method for chemically treating metal surfaces. Background technique [0003] Metal materials need to be tumbled before being plated. Rolling treatment is a process in which batches of parts and grinding media are rotated in a drum at a low speed, and the relative movement of parts and abrasives is used for finishing treatment. Wet machining grinding media commonly used in the tumbling process contain abrasives, chemical accelerators (brighteners) and water. Good rolling treatment can effectively guarantee the quality of plating and prevent metal materials from being corroded. The electric heating tube is a workpiece that has been working in a high-temperature and high-humidity environ...

Claims

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Application Information

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IPC IPC(8): B24B31/00C23C22/48C23C22/68C23G1/02
CPCB24B31/00C23C22/48C23C22/68C23G1/02
Inventor 沙国伟
Owner JIANGSU SHUNFA ELECTRIC HEATING MATERIAL