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What causes spots on the surface of aluminum profiles?

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What causes spots on the surface of aluminum profiles?

  • 19 September,2018

I . Improper anodizing pretreatment


1.The concentration and temperature of the pretreatment alkaline etching tank are too high, the alkali etching tank is polluted, the alkali etching time is too long, and the cleaning after the alkali etching is not timely or clean enough, all of which may cause the above problems.

2.Chemical polishing proportion imbalance. Temperature, time, moisture, aluminum ions, impurities, worker operation, cleaning after chemical polishing, are likely to appear above the problem.


Improvement method:

Strictly control the operation process such as alkali etching and chemical polishing time, temperature, concentration. Operators must be strict when operating carefully, careful observation, can find problems in time.


II. The problem of anodizing tank


1. The temperature, concentration and voltage of the oxidation tank may lead to loose quality of the oxide film and affect the binding force of the oxide film, which may lead to the shedding of the oxide film.

2. White spots may also occur when the aluminum ions in the oxidation tank exceed 15g/L.


Improvement method:

Strengthen the maintenance of the oxidation tank solution, and often analyze the concentration of the oxidation tank solution and the content of other impurities.


III. The white spots were most likely before and after the oxidized coloring


1. After oxidation, the oxide film is not dyed in time, which results in the oxide film being polluted by the outside environment, or exposed to other things before dyeing, thus destroying the oxide film.

2. Cleaning before dyeing is not clean enough. The acid was not thoroughly cleaned.

3. The quality of the water in the washing tank is also affected.


Improvement method:

After oxidation, it should be dyed in time to strengthen the flow water cleaning, and it is better to be neutralized with 10% ammonia water before dyeing, and to add multiple routes of deionized water cleaning.

ABOUT US BV Chemicals Co., Ltd. was established in 1998,which is located in Foshan city of Guangdong province in China, is a wholly-owned engaged in aluminum surface treatment chemical and water treatment chemical products of high-tech enterprises. Our company provides the chemicals and solutions for all kinds of industrial and municipal sewage treatment plants. We also developed a series of chemical products for the surface treatment of aluminum. The company is equipped with a 3,000-square-meter warehouse of chemical raw materials and logistics department, which provide customers with convenient and convenient after-sales services. We have accumulated rich import and export experience and have a quality foreign trade team. Timely and efficient after-sales service has been recognized by the majority of customers. ‘Green chemistry creates a better life’ is our company’s goal. ‘Rapid response,Immediate action, Excellent quality, Credit first’ is our company's tenet.  We believe that we can meet the requirements of domestic and foreign customers with high-quality products, reasonable price, timely delivery, and perfect service. Address: Room 603, RuiYing Building, Chengnan 1st Road, Dali Town, Nanhai District, Foshan City, Guangdong Province, China Email: exp006@broviecn.com Fax: 0086-0757-85510580 Mob:+86 13600312264 Website:www.bv-chem.com

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