It is a very special surface coating for aluminum and is made by an electro-chemical process. The electrolyte used is usually an acidic solution. The aluminum to be coated is the anode of the electrolysis process.

• Extrusion die design.
• Extrusion speed and cooling differences.
• Changes in heat treatment conditions (time, temperature, cooling, etc.).
• Aluminum raw material alloy value differences.
• Matting time differences.

Detection quality is measured by paint stain test, conductivity device (anotest), weight loss test. Error types and solutions are mainly as follows;

• Remaining dust on the material surface;
  • The pH of the bath should be adjusted.
• White powder that comes out as it is wiped on the surface of the material;
  • Improper anodizing temperature.
• Improper detection temperature;
  • Putting the lowest and highest temperature alarm value on the poolside or automation system.
• Inappropriate pH amount;
  • According to the ideal range of auxiliary chemical working, ammonia diluted at low pH level and diluted acetic acid at high pH level should be added.
• Insufficient addition of auxiliary chemicals;
  • Automatic dosing can be done according to production m2.
• The bath should be filtered against the particles that may form. Equal distribution of temperature is ensured by recirculation.

• Anodized profiles with micron or surface defects are processed in the dismantling caustic bath.
• The profiles whose surface coating is removed are rinsed.
  The surfaces are cleaned and rinsed in the neutralization bath.
• Suspension attachment points are changed without waiting for hangers.
• If needed, profiles are satinated.
• It is taken to chemical pool processes again.
• The caustic etching times of the profiles that are processed for the second time should be reduced by half.
• Special stripping baths are used for coatings such as cold fixation etc.
• If the chemical process of the profiles to be processed for the second time is prolonged, the products will be corroded and discarded.

• It is a bath used to clean the stains remaining on the surface after basic abrasion.
• It is recommended to use the bath, which is established with an average of 180-200 grams/liter sulfuric acid before anodizing, to extend the life of the anodizing pool.
• There are dissolved aluminum and auxiliary chemicals in the bath. The purpose of the auxiliary chemical is to reduce the corrosive effect of sulfuric acid.
• Important parameters;
  • Sulfuric acid concentration
  • Dissolved aluminum and alloy concentration
  • Auxiliary chemical concentration
  • Processing time
  • The hanger is the draining time.

One of the aluminum surface treatment costs is its chemical costs. When calculating the amount of chemicals used during the month, the formula beginning period + amount taken during the period-end of the period is used. Afterwards, the g / m2 calculation is made by subtracting the m2 of the material treated with that chemical.

Keeping track of your own consumption according to the industry average allows you to manage your chemical costs. Approximately 70% of anodizing chemical costs are caustic, sulfuric acid and tin sulphate.

• The suspension ports are not cleaned well.
• Aluminum suspension rods are not tightened well to the busbar profile.
• No electric current flows due to the dirtyness of the busbar profiles.
• Bar pool contact point (copper surface) impurities.
• Low anodizing pool concentration.
• Wrong m2 calculation.

Caustic (NaOH) generally has two forms: liquid and solid. It is recommended to use in anodizing plants according to the following items.

• Liquid caustic is generally used because of the ease of dissolution in the anodizing bath.
• Liquid caustic is a chemical that can crystallize below 15 °C. During the winter months, caustic freezing problems are encountered in the enterprises. The caustic storage tank can be isolated and heated to 20-30 °C in electric heaters.
• By isolating the transmission lines of the caustic to the baths and wrapping the heating resistors, the freezing of the caustic in the pipes can be prevented.
• It is recommended that the transmission lines be made of stainless material. Plastic lines will become brittle over time.
• The point of adding caustic to the pool should be below the pool edge, close to the pool working level. (Risk of splashing during addition)
• After the caustic addition process, the lines can be cleaned by blowing air into the line in a closed circuit manner.
• In order to prevent the addition of excess caustic; A timer can be placed on the additional pump. (Pump automatically shuts down after adding pump flow rate and need)
• It should not be forgotten that appropriate protective equipment must be used during work.

It is a test performed according to ISO 3210 to evaluate the quality of anodized coating.

• Area of calculated anodized aluminum part; It is treated with phosphoric acid and chromic acid prepared at a certain concentration.
• At the end of the process, the weight loss per unit area is calculated from the weight loss of the aluminum part.
• The test result should be 30 mg/dm2.