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HDG Offers Three Types of Protection Against Corrosion
• BARRIER: The four-layer galvanized coating provides superior barrier protection to prevent corrosion. The harder alloy intermetalic layers mean the coating is very difficult to compromise.
• CATHODIC: The electrochemical relationship between zinc and steel in the presence of an electrolyte, like moisture, means that if the galvanized coating is ever compromised down to the bare steel that the electrons in the zinc will “sacrifice” themselves to prevent corrosion. A “flash” rust will occur on the surface. But then the corrosion stops. Over time zinc from the top layer will flow into a cut up to ¼” in the coating to “heal” it.
• ZINC PATINA: The zinc patina is a hard, thin film that forms on the galvanized coating when it reacts with the oxygen, moisture and carbon dioxide in the air. The zinc patina acts a barrier for the galvanized coating and must wear off before the galvanized coating can begin to wear.
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