Shot Blasting (Sand Blasting) Treatment

2026-11-03

Shot blasting (sand blasting) is a common surface treatment process prior to hot-dip galvanizing. It uses compressed air to propel shot or sand media to strike workpieces and remove contaminants such as welding slag, paint and rust. It is especially s…

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Pickling

2026-10-26

## I. Purpose of Pickling and Rust Removal MechanismSteel workpieces have scale and rust such as FeO, Fe₂O₃ and Fe₃O₄ on their surfaces, which must be removed prior to hot-dip galvanizing. Otherwise, the fluxing effect will be reduced and skip pla…

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Old Paint Removal

2026-10-19

I. Purpose of the ProcessWhen the old paint film on workpieces suffers from coating defects, transportation damage or aging damage and re-hot-dip galvanizing is required, the old paint film must be removed. Old paint removal methods fall into three ca…

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Degreasing

2026-10-12

I. Functions and Impacts of DegreasingDegreasing is a basic pre-treatment process for hot-dip galvanizing. Oil contaminants on workpiece surfaces originate from mineral oils, animal and vegetable fats used during processing, storage and transportation…

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Corrosion of Steel Materials

2026-10-08

## I. Essential Process of Metal Corrosion1. Definition: A process in which metals undergo phase transformation, form new substances and suffer damage under the action of media.2. Thermodynamic Driving Force: Energy input is required for metal smeltin…

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Hanging Workpieces

2026-09-28

I. OverviewWorkpieces for batch hot‑dip galvanizing are of various types, and racking is the primary process in batch galvanizing. Early practices adopted hoisting whole bundles for secondary racking, which suffered from low efficiency. Modern factor…

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Process Classification and Procedures

2026-09-21

I. Development History1. In 1742, Melouin pioneered the protective method of immersing iron in molten zinc;2. In 1836, Sorel obtained the hot‑dip galvanizing patent, specifying pickling and ammonium chloride fluxing processes;3. In 1836, similar pate…

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High‑temperature Hot‑dip Galvanizing

2026-09-14

High‑temperature hot‑dip galvanizing is a technical solution to address galvanizing defects of high‑silicon reactive steel (wSi≈0.3%).1. PrincipleWhen the zinc bath temperature exceeds 530 C, the ζ phase disappears. Liquid zinc is in equilibrium…

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Influence of Surface State of Silicon‑containing Steel on Hot‑dip Galvanized Coating

2026-09-07

For silicon‑containing steel, at the Sandelin peak ($w_{Si}≈0.1\%$) and $w_{Si}＞0.3\%$, local explosive growth tends to occur, forming coarse ζ‑phase, which deteriorates coating appearance, degrades mechanical properties and increases zinc consum…

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Effects of Silicon‑containing Reactive Steel on Hot‑dip Galvanizing

2026-08-31

1. Background and Sandelin EffectSilicon is used as a deoxidizer in continuous steel casting to produce silicon‑containing reactive steel. Silicon in steel significantly accelerates the iron‑zinc reaction, which is known as the Sandelin effect. Two …

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Influence of Chemical Composition of Zinc Bath on Iron-zinc Reaction

2026-08-17

In hot-dip galvanizing, the zinc bath contains various elements apart from the zinc matrix. These elements originate from three sources: dissolution from workpieces or self-generation in the zinc kettle, intentional additions, and inherent constituent…

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Influence of Chemical Composition of Steel on Iron-zinc Reactions

2026-08-10

## I. Basic BackgroundHot-dip galvanized structural steel contains silicon, manganese, sulfur, phosphorus, oxygen, nitrogen, hydrogen and various intentionally added alloying elements in addition to carbon. Silicon and manganese are essential deoxidiz…

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Hot-dip Galvanizing Reactions

2026-08-03

## I. Iron-zinc Phase Diagram and Various Intermetallic Compound PhasesFundamental Function of the Iron-Zinc Phase Diagram: Hot-dip galvanizing is essentially a process of mutual reaction and diffusion between iron and zinc, and the evolution of coati…

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Structure and Properties of Zinc

2026-07-27

## I. Microscopic Structures of Zinc (Three Hierarchical Structures)### 1. Atomic Structure(1) Basic parameters: Zinc is an element in Group IIB zinc subgroup of the 4th Period with an atomic number of 30 and a relative atomic mass of 65.38. Its valen…

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Process Performance Characteristics and Applications of Zinc Coatings

2026-07-20

## I. Two Major Categories of Hot-dip Galvanizing ProcessesPrinciple of Hot-Dip Galvanizing: Pretreated steel workpieces (cleaned and activated) are immersed in molten zinc liquid. Iron-zinc alloy coatings form via iron-zinc diffusion reactions. The p…

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Corrosion Resistance of Zinc Coatings

2026-07-13

## I. Electrochemical Corrosion Principle of Zinc Coatings1. Microscopic Corrosion Cause: Defects exist in the purity and uniformity of zinc coatings, forming countless micro galvanic cells in corrosive media and triggering localized electrochemical c…

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Protective Coatings for Steel Materials

2026-07-06

## I. Hot-dip Coatings1. Process Principle: Immerse steel workpieces in molten metals (zinc, aluminum, tin, lead, etc.) whose melting points are far lower than that of steel. Dissolution, diffusion and chemical reactions occur between the substrate an…

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The Importance Of Protection For Steel Materials

2026-06-22

1. Steel has a wide range of applications yet is prone to corrosion in various media. Massive quantities of steel worldwide are lost to corrosion every year. Protective coatings can not only extend the service life of components but also endow materia…

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Galvanizing Process Flow

2026-06-17

Pre-treatmentIncoming Inspection → Degreasing → Washing → Pickling → Washing → Fluxing → DryingCore GalvanizingHot-dip Galvanizing → CoolingPost-treatmentWashing → Chromate-free Passivation → Inspection & Repair → Packing → Delivery

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