Zincoated

Zincoated refers to metal surfaces or products that have been coated with zinc to improve corrosion resistance. The zinc coating provides protection through two main mechanisms: it acts as a barrier to moisture and oxygen, and it functions as a sacrificial anode that corrodes preferentially if the underlying metal is exposed. This combination helps extend the service life of steel or iron components in various environments.

The most common methods to achieve zincoating are hot-dip galvanizing and electrogalvanizing. Hot-dip galvanizing involves immersing pre-fabricated parts in molten zinc, forming a metallurgical bond and typically yielding a thicker, more abrasion-resistant coating with a characteristic spangled surface. Electrogalvanizing deposits zinc electrolytically, producing thinner, more uniform coatings suitable for complex shapes and precise parts. Other approaches include zinc spraying and sherardizing.

Coating thickness varies by method; hot-dip galvanizing generally delivers roughly 50–150 micrometers, while electrogalvanizing produces coatings of only a few micrometers. The coating’s performance depends on environmental exposure, substrate quality, and maintenance. In non-maritime environments, zincoated steel commonly lasts several decades; coastal or industrial settings, mechanical damage, or inadequate coating thickness can shorten service life.

Standards govern zincoated products, with widely cited specifications including ISO 1461 and ASTM A123 for hot-dip galvanized coatings, and related European and other national standards. Zinc coatings are prevalent in construction, automotive parts, fasteners, plumbing, and agricultural equipment due to their durability and cost-effectiveness.