Overview
Hot-dip galvanized steel is produced by immersing carbon steel in molten zinc at ~450°C, forming a metallurgically bonded zinc-iron alloy coating. The '加厚镀锌' (thick galvanizing) variant features zinc coatings exceeding standard weights (typically 50-600 g/m²), offering enhanced corrosion protection for harsh environments. This process creates a layered structure: the outer pure zinc layer provides sacrificial protection, while inner zinc-iron alloy layers ensure adhesion. The coating thickness typically ranges from 10-100 microns, with thicker coatings used for industrial applications like transmission towers or marine hardware.
Physical and Chemical Properties
The zinc coating exhibits excellent cathodic protection, corroding preferentially to the underlying steel. Its corrosion resistance depends on coating thickness and environmental factors—approximately 1/30 the corrosion rate of bare steel in rural atmospheres. Key metrics include coating mass (measured in g/m²), spangle size (regular or minimized), and adherence (tested via bend or impact tests). The zinc layer hardness ranges from 70-150 DPN, while the base steel retains its original mechanical properties (yield strength: 250-550 MPa for common grades).
Main Applications
Thick galvanized steel is essential for infrastructure projects like highway guardrails (ASTM A123) and utility poles, where decades-long service life is required. In agriculture, it resists fertilizer corrosion in equipment like grain silos. The automotive sector uses thinner coatings (e.g., 7-10μm) for underbody components, while heavy-industry applications include offshore oil platforms (ISO 1461 Class 4) and industrial ducting. Recent innovations include magnesium-alloyed coatings for improved cut-edge protection.
Safety and Storage
Zinc-coated products require dry storage to prevent 'white rust' (zinc hydroxide formation) during transit. Stacking should use wooden separators to avoid coating damage. Relative humidity should remain below 60%. Fabrication safety includes local exhaust ventilation when welding or grinding to prevent metal fume fever from zinc oxide inhalation. Alkaline cleaners (pH <12) are recommended for surface preparation—acid pickling destroys the zinc layer.
B2B Procurement Guide
Specify these parameters: 1) Coating designation (e.g., Z600 per EN ISO 1461), 2) Base steel grade (S355JR vs. SS400), 3) Surface treatment (chromate passivation for paint adhesion). Mill certificates should verify coating weight via magnetic gauge testing. For cost optimization, consider dual-side differential coating (thicker on exterior surfaces). Lead times vary by thickness—standard 2-3mm sheets are typically spot-stocked, while 8mm+ plates may require 4-6 week production scheduling.
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