There are more kinds of zinc plating. According to different needs, there are ordinary, dull, black zinc and so on. Use different colors according to different needs. Beautiful and rust-proof.

Function: Chromium plating is to isolate the direct contact between the metal and the atmosphere through the coating (stable and dense), thus protecting the metal body. The galvanized layer is used as anode protection to protect the metal body by sacrificing itself. The metals mentioned here refer to iron and various steels.

Galvanized coating is an anode coating, which is mainly used to prevent the corrosion of steel, and its protective performance is closely related to the coating thickness. After passivation treatment, dyeing or coating with photo-protective agent, the protective and decorative properties of zinc coating can be significantly improved.

Chromium plating layer has good chemical stability, and does not work in alkali, sulfide, nitric acid and most organic acids, but it can be dissolved in hydrochloric acid (such as hydrochloric acid) and hot sulfuric acid.

In the visible range, the reflectivity of chromium is about 65%, which is between silver (88%) and nickel (55%), which is better than silver and nickel, because chromium does not change color when used and can maintain its reflectivity for a long time.

Extended data:

Galvanizing solution:

Zinc plating solution includes cyanide plating solution and cyanide-free plating solution.

Cyanide plating solution can be divided into micro-cyanide, low-cyanide, medium-cyanide and high-cyanide.

Cyanide-free electroplating solution includes alkaline zincate electroplating solution, ammonium salt electroplating solution, sulfate electroplating solution and ammonia-free chloride electroplating solution. Cyanide zinc plating solution has good plating ability, and the obtained coating is smooth and detailed, which has been used for a long time in production.

However, due to the toxicity of cyanide and serious environmental pollution, low cyanide, micro cyanide and cyanide-free zinc plating solutions have been adopted in recent years.

In the plating bath containing zinc plating solution, the cleaned and specially pretreated workpiece is used as the cathode, the anode is made of electroplated metal, and the two poles are respectively connected with the positive electrode and the negative electrode of DC power supply.

The zinc plating solution consists of an aqueous solution containing electroplating metal compounds, conductive salts, buffers, pH regulators and additives. After electrifying, the metal ions in the zinc plating solution move to the cathode under the action of potential difference, forming a coating.

The metal of the anode forms metal ions in the zinc plating solution to maintain the concentration of electroplating metal ions. In some cases, such as chromium plating, it is an insoluble anode made of lead and lead-antimony alloy, which only plays the role of transferring electrons and conducting current.

The concentration of chromium ions in the electrolyte is maintained by adding chromium compounds to the plating solution regularly. During zinc plating, the quality of anode material, composition of zinc plating solution, temperature, current density, electrifying time, stirring intensity, precipitated impurities, power waveform, etc. Will affect the quality of the coating and need to be controlled in time.

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