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Zinc-Aluminum-Magnesium Cable Tray Sets New Benchmark in Corrosion Protection with Triple-Layer Protection Technology
Sep 29,2025
The rise of zinc-aluminum-magnesium cable trays stems from their innovative ternary alloy coating technology. Unlike traditional pure zinc coatings, this coating comprises zinc (Zn), aluminum (Al), and magnesium (Mg), typically containing 5%-11% aluminum and 1.5%-3% magnesium. Through hot-dip galvanizing, it forms a dense ternary eutectic structure, establishing a triple-layer protection system.
The primary barrier protection is dominated by aluminum, forming an ultra-thin aluminum oxide film on the tray surface. This acts like a dense “metal armor,” effectively blocking the intrusion of corrosive agents such as air and moisture into the substrate. The second layer employs sacrificial anode protection, where zinc and magnesium synergistically corrode themselves through electrochemical reactions, providing continuous shielding for the steel substrate. This corrosion current is one order of magnitude lower than that of aluminum-zinc coated products. The most distinctive third layer is the self-healing function. When the coating is damaged during cutting or installation, magnesium and zinc ions actively migrate to the scratched areas. They form dense corrosion products like basic zinc chloride, automatically sealing the damaged points and preventing the spread of red rust.
Salt spray test data confirms its performance advantages: in a 3.5% NaCl solution test, the zinc-aluminum-magnesium coating exhibited a loss rate of only 0.034 g·m⁻²·h⁻¹, which is one-thirtieth that of ordinary galvanized steel sheets, representing a 10-20 times improvement in corrosion resistance. In harsh environments like coastal areas and chemical plants, a 6-month outdoor exposure test revealed no significant red rust at cut edges, whereas traditional galvanized products exhibited extensive corrosion.
This “cost-effective stainless steel alternative” costs only slightly more than hot-dip galvanizing yet achieves corrosion resistance comparable to stainless steel. It retains easy cutting and installation properties, requiring no specialized tools for construction. It is progressively replacing traditional materials as the preferred choice for corrosive environments.
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