Electroplated chromium plated steel plate for electric heating tubes

The low-carbon steel plate with surface chrome plating is called chrome plated steel plate, which is a newly developed substitute material for tin plating to reduce the amount of tin used and production costs. It is also known as chromium type type Wuxi thin steel plate or Wuxi steel plate. Chromium plated plates have poor corrosion resistance and must be coated with paint before use. The chrome plated plate coated with paint has a strong adhesion to the film, making it suitable for manufacturing the bottom cover and flushing cans of food cans. Wuxi steel plate has the following advantages and disadvantages compared to tinplate:

1. Advantages of Wuxi Steel Plate

(1) Penyaduran amaun is small, therefore the cost is relatif rendah

(2) Salutan has good adhesion. The surface oxide film is honeycomb like and contains genes such as - OH, so it has strong adsorption and wetting ability on the coating, which more than 2-5 times the adhesion of the same coating on the sheet metal. It also does not have the missed coating fish eye or crater that is prone to occur on the sheet metal.

(3) Baik suhu rintangan, tanpa the fenomena of tinplate suhu rendah "tin epidemik".

(4) It has high sulfur resistance and alkali resistance. Because chromium and chromium oxides do not react with sulfur and alkali, they have excellent sulfur and alkali resistance, do not sulfurize and turn black, and have good corrosion resistance to atmosphere, organic solvents, oils, etc.

2. Kelemahan daripada Wuxi keluli plat berbanding to tinplate

(1) The poor spot welding performance of the chromium layer requires special welding equipment or welding after removing the chromium layer. Amnya, fusion welding and bonding methods are used for tank body joints. (2) When the oxide film is thick, the ductility will deteriorate. (3) Poor acid and corrosion resistance generally requires the application of high acid resistant coatings in order to be used in weakly acidic environments.

The chromium plating process of Wuxi board adopts a low concentration two-step electroplating method, which not only reduces the consumption of chromium but juga reduces the treatment amount of wastewater, which is beneficial for reducing environmental load. The coating is thin and uniform, and the cost is lower. At present, the main application range of chrome plated steel in China is beer bottle caps, beverage and neutral food can coating caps, and it is rarely used as food cans. In foreign countries, a large number of Wuxi plates with inner coating and outer printing are used as fish and meat cans, especially two-piece cans, fully leveraging the advantages of Wuxi plates in terms of excellent resistance to sulfur black and strong coating adhesion.

Galvanized keluli plat

Galvanized steel plate, commonly known as white iron sheet, is a low-carbon thin steel plate with a galvanized surface. Galvanized coating is a protective coating that can protect steel plates from atmospheric corrosion during use. The zinc coating is generally subject to passivation treatment. The passivation film formed after passivation in chromic acid or chromate solution is not easy to interact with humid air, and has strong anti-karat ability. Walau bagaimanapun, zinc is easily soluble in acids or alkalis and easily reacts with sulfides, so it is not suitable for packaging products that are acidic, alkaline, or sulfides.

www.superbheater.com