Galvanized Coating Thickness


How to Measure Galvanized Coating Thickness?

Galvanized coating is applied in order for the metals to continue their intended use for the longest time. For this, hot dipping and electrolysis methods are used. The method can be chosen according to the place where the material will be used. Alusi products are obtained by coating aluminum-zinc alloy on the steel sheet according to the needs.

Galvanized Coating Thickness Calculation

Galvanized coating represents the amount of zinc per square meter. Considering all the standards in the world, it is seen that the cross-sectional values of the material are taken into account in determining the galvanization coating thickness. If you know the width, length and thickness values of your plate, you can calculate the galvanized weight.

You can find the zinc weight per square meter by multiplying the galvanized coating weight with the zinc unit volume. Zinc unit weight 6.9 to 7.0 kg/dm3'kind. When you convert to kilograms, 6900-7000 kg/m3 will be. For example, if you are going to make a coating of 40 µ;

  • (7000kg/m3) x (40×10)-6 meters) = 0.28 kg. “1µ = 10-6meters.” 
  • If we want the result in grams, it will make (0.28 kg) x (1000) = 280 grams.

* Unit conversions are very important for the calculation to be correct. When the coating thickness is made above the standard, the dependence of the coating on the material decreases. Therefore, spills can be observed in the coating.

Galvanized Sheet Weight Table

It is made on 650 gr coating sheets. The reason for such a high coating is that zinc flows onto the exposed surface after the sheet is cut. It is ensured that all surfaces are covered by cutting the coating in a short time. This method is very useful when producing products such as coil sheet slitting.

Galvanized Coating Thickness Standard

In an electro galvanized material, the thickness is 8-12 µ. In hot galvanized coating, the amount of thickness varies according to the size of the steel, but it can be said to be 50 µ on average. Due to the difference, the materials coated with electro galvanized are suitable for indoor use, and the ones covered with hot galvanized are suitable for use indoors.

Coating thickness reference table is given in “TS 914 EN ISO 1461 Hot Dip Galvanized Coatings on Materials Made of Iron and Steel - Properties and Test Methods”.

How Much Does Galvanized Coating Thickness Change Corrosion Life?

Corrosion formation for metal materials develops depending on atmospheric conditions. When metal materials to be used outdoors are exposed to water and moisture, corrosion is observed. Since rusting is a rapidly progressing process, it is necessary to take precautions. For this reason, the parts used in the interior and exterior parts of the devices are galvanized. The service life of galvanized materials varies in direct proportion to their corrosion resistance. Uncoated materials that will lose their function in a few years will corrode 15 to 100 years later. There is no other way to make such good protection than by galvanizing. In order to use the galvanized sheet for a longer time, paint can be applied on it. This way is also preferred for a decorative appearance in homes.

Factors Affecting Corrosion Resistance of Galvanized Sheets

In galvanized sheets;

  • Chemical properties of the material to be galvanized,
  • atmospheric conditions,
  • surface defects,
  • Surface roughening stage,
  • Chemical properties of the zinc pool and the zinc coating,
  • Selection of metals to be used in passivation,
  • Factors such as the use of protective oil affect corrosion resistance.

How to Measure Galvanized Coating Thickness?

Galvanized coating thickness is controlled by quality officers or quality control engineers in the factory. The company that makes the coating and the company that receives the material make two separate measurements. Thickness device is used for measurement. Thickness can also be determined using a digital micrometer. If the measurement result does not have the standard thickness or is incorrect, the products can be sent for re-coating. The results obtained are documented and sent to the company to which the material will be sent as an e-mail.

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