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Chromizing treatment technology for food grade aluminum foil

A technology of chromization treatment and aluminum foil, which is applied in the direction of metal material coating process, etc., can solve the problems of chromization layer thickness, uneven color, poor overall effect, incomplete cleaning, etc., to achieve uniform color and strong practicability , the effect of perfect overall function

Inactive Publication Date: 2019-04-05
JIAXING JINXIN AL CONTAINER
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AI Technical Summary

Problems solved by technology

However, because the existing chromizing process is simple, the cleaning before and after chromizing is not complete, the thickness and color of the chromizing layer after chromizing are uneven, the corrosion resistance is poor, and the overall effect is not good.

Method used

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Embodiment Construction

[0018] The present invention will be further described below in conjunction with preferred embodiments.

[0019] A kind of chromizing process of food-grade aluminum foil involved in the present embodiment comprises the following steps:

[0020] a. First, the aluminum ingot formed by molten aluminum is cast and rolled into an aluminum plate of 5-6 mm, and then cast and rolled to a thickness of 0.08-0.11 mm to form an aluminum sheet;

[0021] b. Degreasing: immerse the aluminum sheet that has been cast and rolled twice in the degreasing tank, and the degreasing tank is filled with alkaline degreasing liquid; wherein, the temperature of the bath liquid is controlled at 60-65 ° C, and the immersion time is controlled at 5-7 minutes;

[0022] In this step, degreasing is to remove the oil stains on the metal surface by alkaline degreasing solution. Aluminum alloy has poor alkali resistance and is not suitable for cleaning with strong alkali. Therefore, the concentration of the bath...

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Abstract

The invention discloses a chromizing treatment technology for a food grade aluminum foil. The chromizing treatment technology comprises the following steps of a, firstly, performing cast rolling on analuminum ingot formed by molten aluminum water to obtain a 5-6mm aluminum plate, and then performing cast rolling on the aluminum plate for many times until the thickness is 0.08-0.11mm to form an aluminum sheet; b, performing degreasing; c, performing washing for the first time; d, performing bright dipping; e, performing washing for the second time; f, performing chromizing; g, performing washing for the third time; h, performing washing for the fourth time; and I, finally, performing drying, wherein in the step b, ultrasonic oscillation is used to perform circulation stirring on an alkaline degreasing bath; and in the steps e and h, the conductivity of pure water is smaller than or equal to 100us / cm. In chromizing treatment, multi-pass cleaning is performed before and after the technology, and various project indexes in the chromizing process are controlled, so that a chromizing layer after chromizing is uniform in thickness and color, good in corrosion resistance, perfect in wholefunction and strong in practicability.

Description

technical field [0001] The invention relates to the technical field of aluminum processing, more specifically, it relates to a chromization treatment process of food-grade aluminum foil. Background technique [0002] Aluminum alloy chromizing treatment is a common pretreatment method for aluminum products. It forms a passivation film on the surface of the product through a chemical reaction to enhance the corrosion resistance of the product and the adhesion of the coating. [0003] The commonly used types of chromium are trivalent chromium chromium and hexavalent chromium chromium. However, because the existing chromizing process is simple, the cleaning before and after chromizing is incomplete, the thickness and color of the chromizing layer after chromizing are uneven, the corrosion resistance is poor, and the overall effect is not good. Accordingly, the present invention proposes a chromizing process for food-grade aluminum foil. Contents of the invention [0004] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C22/24C23C22/78C23C22/82
CPCC23C22/24C23C22/78C23C22/82
Inventor 姜挺
Owner JIAXING JINXIN AL CONTAINER
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