Phase 1: Maturity and popularization of technology (mid-20th century present)

Hot dip galvanizing (HDGI): the dominant process. From the early flux method to the modern Sengemir method, continuous, high-speed, and high-quality production has been achieved. At present, lead-free hot-dip galvanizing and alloying galvanizing have become standard equipment for high-end products.

Electrogalvanizing (EGI): The surface is more uniform and smooth, suitable for products with high surface requirements and subsequent coating needs (such as automotive exterior panels and home appliance panels).

Phase 2: Performance Upgrade and High Intensity (Since the 21st Century)

With the lightweighting of automobiles and the improvement of building safety standards, the demand for steel strength has surged.

Development focus: Developing galvanizing technology for "high-strength steel substrates" while ensuring good coating adhesion and formability. The pressure has generally increased from 340MPa to 780MPa, 980MPa, and even 1500MPa.

Key technologies: Advanced High Strength Steel (AHSS) and Galvanizing Technology for Hot Formed Steel.

Phase 3: Environmental Protection and Sustainable Development (Current Core Trends)

Chromium free passivation: replaces traditional chromate passivation with environmentally friendly chromium free passivation solutions (such as silane, zirconium, molybdate, etc.), meeting environmental regulations such as RoHS and REACH.

Coating thinning and precise control: Through precise control of technologies such as air knife control and induction heating, while achieving the same anti-corrosion performance, the amount of zinc used is reduced, costs are lowered, and green manufacturing is achieved.

Zinc aluminum magnesium coating (ZAM): the current hottest topic. Adding elements such as aluminum and magnesium to zinc solution, its corrosion resistance (especially edge protection) is 5-20 times that of ordinary galvanizing, and it is rapidly replacing some traditional galvanizing markets, known as the "revolutionary coating".

Phase 4: Intelligence and Customization (Future Direction)

Intelligent Manufacturing: Utilizing big data, AI, and machine vision to monitor coating thickness and surface defects in real-time online, achieving automatic process optimization and predictive maintenance of product quality.

Product customization: Provide customized combination solutions of "substrate coating post-treatment" based on the specific usage environment (coastal, industrial areas, etc.) and processing technology (bending, welding requirements) of downstream customers (such as automobile factories, photovoltaic bracket factories, home appliance factories).