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Aesthetics of zinc coating

Why do steel components look different after galvanizing?

In addition to long-term corrosion protection, aesthetic qualities are usually also very important. Significant factors determining the achievement of such qualities are:

  • the chemical composition of the steel from which the structure will be made, as this affects the different colouring and structure of the zinc layer;
  • optimal parameters of the technological process, such as zinc temperature or immersion time;
  • the handling of the galvanized product - in order to avoid the formation of white corrosion, hot-dip galvanized components should be stored in a way that allows air flow.

Time lapse and material construction

The zinc coating can change its appearance over time becoming more matt. This is a natural oxidation process of the metal. The component to be galvanized should consist of a single grade of steel with similar wall thicknesses.

Occasionally, gouges or other damage is produced on the surface of metal products during the manufacturing stage. Unevenness can also arise during the hot-rolling process of steel. Such surface defects become apparent after galvanizing, creating a roughness / coarseness on the surface of the coating.

Guidelines for steel surfaces

The surfaces of the components should be free of:

  • collapses,
  • scale,
  • weld spatter,
  • sharp edges,
  • contamination by paints, emulsions, materials used for scribing, marking, welding or drilling.