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A kind of surface black hardening treatment method of aluminum cookware

A technology of hardening treatment and cooking utensils, applied in the direction of surface reaction electrolytic coating, electrolytic coating, coating, etc., can solve the problems of difficult formation of thick film, high energy consumption, slow film forming speed, etc., and reduce the temperature and current of the electrolyte The effect of high density and wide temperature range

Active Publication Date: 2016-01-20
JIANGMEN ANNUOTE COOKING UTENSILS MFG
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such surface black hardening treatment method has the following disadvantages: (1) high energy consumption and low production efficiency; (2) in the system using pure sulfuric acid as an anodic oxidation treatment electrolyte, local overheating is serious and it is not easy to form a thick film; (3) ) The temperature range of the working fluid is narrow; (4) The film forming speed is slow: according to the current technology, the film forming speed is generally 1.0um / min; (5) The hardness is not high enough: the existing technology is generally 300-380HV; (6) The surface Uneven black; (7) prone to adverse phenomena such as "ablation" and "powdering"

Method used

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  • A kind of surface black hardening treatment method of aluminum cookware
  • A kind of surface black hardening treatment method of aluminum cookware

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] (1) Prepare the electrolyte, the formula of the electrolyte is:

[0043] Sulfuric acid: 100g / L

[0044] Compound organic acid: 1g / L

[0045] AL 3+ : 2g / L

[0046] Wherein, the composition of compound organic acid is: citric acid 0.5g / L, malic acid 0.5g / L.

[0047] The electrolyte temperature was 10°C.

[0048] (2) After connecting the cooker with one electrode, soak it in the electrolyte. Another electrode is set in the electrolyte, and an alternating current is passed between the two electrodes, and the aluminum cooker is electrolytically oxidized for 20 minutes. The waveform diagram refers to figure 1 , where I + =5A / dm 2 , I - =3A / dm 2 , t - =50ms,t + =500ms.

Embodiment 2

[0050] Follow these steps to dispose of aluminum cookware:

[0051] (1) Prepare the electrolyte, the formula of the electrolyte is:

[0052] Sulfuric acid: 150g / L

[0053] Compound organic acid: 10g / L

[0054] al 3+ : 7g / L

[0055] Wherein, the composition of compound organic acid is: oxalic acid 5g / L, lactic acid 5g / L.

[0056] The electrolyte temperature was 20°C.

[0057] (2) Conduct AC electrolysis on aluminum cookware for 30 minutes, where I + =10A / dm 2 , I - =5A / dm 2 , t - =1ms,t + =12ms.

Embodiment 3

[0059] Follow these steps to dispose of aluminum cookware:

[0060](1) Prepare the electrolyte, the formula of the electrolyte is:

[0061] Sulfuric acid: 200g / L

[0062] Compound organic acid: 20g / L

[0063] AL 3+ : 13g / L

[0064] Among them, the composition of the compound organic acid is: oxalic acid 7g / L, lactic acid 13g / L.

[0065] The temperature of the electrolytic solution was 30°C.

[0066] (2) Conduct AC electrolysis on aluminum cookware for 40 minutes, of which, I + =1A / dm 2 , I - =1A / dm 2 , t - =100ms,t + =800ms.

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Abstract

The invention discloses a surface black hardening treatment method of an aluminum cooker. The method comprises the following steps: (A) preparing an electrolyte; and (B) connecting the cooker with an electrode, soaking in the electrolyte in which another electrode is arranged, supplying an alternate current between the two electrodes for electrolytic oxidation of the aluminum cooker, wherein the forward and reverse current densities of the alternate current are I+ and I- respectively, I+=1-10A / dm2, I-=1-5A / dm2, the time of forward current is t+, the time of reverse current is t-, t-=1-100ms, and t+=(8-12)*t-. The invention also further provides a hardened electrolyte formula. The method has the advantages that the operating fluid temperature range is wide, the film-forming speed is high, the film obtained by the method is high in hardness, the surface black is uniform and consistent, the cracking phenomenon is greatly reduced, the energy consumption is reduced, and the production efficiency is improved.

Description

technical field [0001] The invention relates to a treatment method for aluminum cookware, in particular to a method for treating aluminum cookware with black surface hardening. Background technique [0002] Aluminum cookware is widely used in daily life because of its advantages of easy processing, light weight, and good physical and chemical properties. In the production process of aluminum cookware, in order to increase durability, aluminum cookware needs to be black-hardened after molding. The general surface black hardening treatment uses direct current to electrolyze aluminum cookware; the hardening treatment requires a low temperature of the working fluid (-7-0°C), a long time (30-60min), and a high power supply voltage (60-100V). Such surface black hardening treatment method has the following disadvantages: (1) high energy consumption and low production efficiency; (2) in the system using pure sulfuric acid as an anodic oxidation treatment electrolyte, local overheat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25D11/14C25D11/10
Inventor 唐家祥雷瑞强胡斯振
Owner JIANGMEN ANNUOTE COOKING UTENSILS MFG
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