The main difference between aluminized zinc plates and galvanized plates lies in the composition and performance of the coating, which directly affects their applicable fields.

Aluminized zinc plates have superior performance in terms of corrosion resistance, heat resistance and heat reflection, while galvanized plates have more advantages in cost, processability and versatility.

The following are their core differences:

 

Galvanized plate

• Coating composition: Zinc (approximately 100%)
• Coating structure: Uniform zinc layer
• Corrosion resistance: Good (under normal conditions)
• Heat resistance: General (can be used in an environment of approximately 200℃
• Thermal reflectance: Medium
• Surface hardness: Relatively low
• Processability: Good, easy to stamp and bend
• Cost: Relatively low
• Main applications: Building structural components, power facilities, home appliance casings (such as chassis), general containers

 

Aluminized zinc plate

• Coating composition: Aluminum (about 55%), zinc (about 43.5%), silicon (about 1.5%)
• Coating structure: Honeycomb structure formed by aluminum-zinc alloy
• Corrosion resistance: Excellent (about 6-8 times that of galvanized sheets)
• Heat resistance: Excellent (can be used at 315℃ high temperature)
• Thermal reflectance: High (about twice that of galvanized sheets)
• Surface hardness: Higher, more wear-resistant
• Processability: Relatively poor, and anti-rust treatment is required for the cutting edges
• Cost: Relatively high
• Main applications: Building roof walls, automotive exhaust pipes/fuel tanks, heat-resistant household appliance components (such as oven inner panels), outdoor facilities

 

Detailed explanation of Key differences

1. Corrosion resistance and protection mechanism

 

The rust prevention principles of the two are different, and their effects also vary significantly.

Galvanized sheet: It mainly relies on the sacrificial anode protection of zinc. The zinc coating acts as a “meat shield” before the steel corrodes, providing uniform electrochemical protection for the base metal. However, in harsh environments such as dampness, acid rain or coastal areas, the zinc layer is consumed relatively quickly.

 

Aluminum-zinc coated sheet: Its coating is an aluminum-zinc alloy honeycomb structure. Aluminum forms a dense film of aluminium oxide on its surface, which blocks corrosive media. Zinc provides local sacrificial protection. This synergistic effect makes its corrosion resistance far exceed that of galvanized sheets. However, once the board is cut, the protective effect on its edges will be significantly weakened, and anti-rust paint must be applied for sealing treatment.

 

2. Comparison of other physical and processing properties

Heat resistance：

Aluminum-zinc coated steel sheets can withstand a high temperature of 315℃ without discoloration or deformation, and are thus often used as inner panels of ovens and the like. The working temperature of ordinary galvanized sheets should not exceed 200℃ for a long time.

Thermal reflectivity：

The thermal reflectivity of aluminized zinc sheet can reach over 75%, approximately twice that of galvanized sheet. When used for building roofs, it offers better heat insulation and cooling effects.

Processability and cost：

Galvanized sheets have better ductility, are easier to undergo complex forming processes such as deep drawing, and have a lower cost. Aluminum-zinc coated steel sheets have high hardness and are relatively difficult to process. Moreover, due to the combined costs of aluminum and zinc, their prices are even higher.

 

Companies can make choices based on their core needs:

If a company is in pursuit of the best anti-corrosion and durability, then we would prefer aluminized zinc plates as our first choice. It is especially suitable for long-term exposed building roofs/exterior walls, facilities in coastal areas, or components that require higher surface hardness.

If a company is engaged in complex forming or cost control, it should choose galvanized sheets. It is more suitable for processing parts that require a large amount of stamping and bending, such as ventilation ducts and cabinets, or for use in dry indoor environments.

If the company has high-temperature environment requirements, such as car exhaust systems, ovens, barbecue grills, etc., then aluminized zinc plates must be selected.

If used as the base plate for color-coated steel sheets, both are acceptable. However, due to its excellent corrosion resistance, the aluminized zinc sheet can extend the overall service life of the color-coated steel sheet.

It is hoped that the above content will be helpful for you to choose between aluminized zinc sheet and galvanized sheet.

 

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