Surface Process of Air Conditioner Bracket

In modern architecture, air-conditioning systems are key installations for ensuring comfortable indoor temperatures. At the same time, the surface treatment technology of its brackets is equally crucial to the aesthetics and functionality of the building. Surface treatment not only enhances the appearance of air conditioner brackets, but also strengthens their weathering and corrosion resistance, significantly increasing their service life.

In terms of surface treatment for air conditioner brackets, there are four mainstream processes that are widely used: spraying plastics, hot-dip galvanising (HDG), Dacromet and cold galvanising. And modern technological development has brought new choices of surface coating technology for air-conditioning brackets, especially the application of powder coating and electrophoretic coating technology. 


The spraying plastics process creates a homogeneous coating by applying a powder coating to the surface of the bracket using electrostatic spraying technology, which is subsequently melted and cured at high temperatures. This process is capable of applying a coloured or monochrome finish to the bracket.

spraying plastics

The hot-dip galvanizing process involves immersing the bracket in a high-temperature bath of molten zinc, which through a chemical reaction induces the zinc to form a strong zinc-iron alloy coating on the surface of the bracket.

hot-dip galvanising

Dacromet, known as zinc-chromium coating technology, is a state-of-the-art anti-corrosion coating that uses zinc powder, aluminium powder, chromic acid and deionised water as its main ingredients. This technology achieves superior corrosion protection by forming a zinc-rich inorganic protective layer on the surface of the bracket. Dacromet is considered an environmentally friendly “green plating” technology compared to traditional plating methods.


The cold galvanizing process involves immersing the bracket in an electrolytic solution containing zinc, which forms a layer of zinc on the surface of the bracket by an electrochemical reaction at room temperature.

the cold galvanizing process

Powder coating technology involves the use of electrostatic spraying to evenly coat the surface of the bracket with a powder coating, which is subsequently baked at high temperatures to form a strong protective layer.

Powder coating technology

Electro-coating, as an electrochemical process, works by immersing the stent in a bath containing electrophoretic paint and using an electric current to deposit the paint uniformly on the surface of the stent, which in turn creates a solid coating.

The following is a detailed description of these processes:

Weather Resistance: Indicates the ability of the material to withstand weathering in outdoor environments.

Abrasion Resistance: Indicates the ability of the material to resist wear and tear.

Application Difficulty: Refers to the complexity of the process and the skill level required of the operators.

Processing Speed: The time required to complete the entire surface treatment process.

comparison of several surface process

Among them, hot-dip galvanising and cold galvanising are two common surface treatments for steel, both of which are designed to prevent rust and corrosion, but each uses different methods, materials and final properties.

Below is a table that compares these two types of galvanizing in detail:
comparison between hot-dip galvanizing and cold galvanizing

Hot-dip galvanizing offers a thicker coating and higher corrosion resistance, making it suitable for external applications subjected to harsh environments, such as outdoor infrastructure and architectural elements. The high-temperature process creates a zinc-iron alloy layer, providing stronger bond strength and longer service life.

Cold galvanizing is a more economical and environmentally friendly option, appropriate for less harsh conditions like indoor structures. It deposits zinc on the steel surface through an electrochemical reaction, offering a simpler process with low energy consumption, but provides a thinner protective layer that may not be as durable as hot-dip galvanizing.

Powder coating and electrophoretic coating are both modern surface treatment technologies that provide corrosion protection and aesthetically pleasing appearance to metal surfaces.

Below is a detailed comparison of these two coating technologies:
comparison between powder coating and electro-coating

Powder Coating offers a thicker coating with very high corrosion resistance and good customization options for appearance, making it suitable for external applications such as furniture, automobiles, and industrial equipment. It utilizes electrostatic spraying technology for even coating distribution and cures at high temperatures to form a robust coating.

Electro-Coating provides a thinner yet extremely uniform and seamless coating with excellent corrosion resistance and adhesion, suitable for both internal and external applications such as auto bodies, bicycle frames, and electronic products. It uses an electric field for even coating deposition and cures at lower temperatures to form the coating.

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