Galvanized Wire Secrets: Rust Stains, Special Types and Market Preferences

The "white rust" and "black rust" of galvanized wire
White rust: When the galvanized layer is isolated from oxygen in a humid and sealed environment, it will form a white powder-like basic carbonate zinc (Zn₅(OH)₆(CO₃)₂), which is not true rust and can be restored by using a weak acid (such as acetic acid).
Black rust: If the zinc layer is completely depleted and the underlying steel is exposed, the red rust (Fe₂O₃) formed is the true corrosion, which is irreversible. Special-purpose galvanized wire
High zinc content galvanized wire (zinc layer ≥ 300g/m²): Used in marine environments or areas with strong corrosion (such as saline-alkali land), such as offshore aquaculture cages, cross-sea bridge cables.
Alloy coated wire (such as zinc-5% aluminum-rare earth): Has 2-3 times higher corrosion resistance than ordinary galvanized wire and is used in long-life scenarios such as photovoltaic supports, highway guardrails, etc. Special demands in the African market
West African countries prefer colored galvanized wire (such as green, blue, red), not for aesthetics, but to distinguish suppliers and price grades by local traders.
These cold facts reflect the technical details and market diversity of the galvanized wire industry, and have certain reference value for quality control, selection, or trade. If more professional domain analysis (such as process parameters or standard comparison) is needed, further discussion can be conducted!