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Golden keel: The surface is mostly galvanized with a thicker zinc layer (usually ≥ 110g/m ²), and its oxidation and corrosion resistance are better than ordinary silver keels. It is not easy to rust after long-term use. ‌‌‌‌
Silver keel: Electroplated Galvanized: The thickness of the galvanized layer is relatively low, and the anti-corrosion performance is average. It can be judged by scratch testing (the metallic luster after scratching is clearly electroplated galvanized); ‌‌
Baking process: The surface is covered with a paint film, and scratch testing will reveal the underlying metal, making it suitable for low humidity environments. ‌‌