HOT IMMERSION GALVANIZING

Here at PROMESA we have hot immersion galvanizing services, where we can galvanize pieces from up to 12m by double immersion. We work by the international standards of ASTM-A123 and ASTM-153 and according to the valid mexican norm of galvanizing NMX-H-0004.

We dispose of a trustworthy supplier certificate issued from LAPEM

The hot immersion galvanizing is a process by which corrosion that attacks materials made from steel or iron is avoided, it is the top anti-corrosive protection for industrial work, civilian, commercial and urban structures.

OUR PROCESS:

1. DEGREASING

Parts undergo a degreasing process that uses alkaline solutions or degreasing agent that also removes dust and dirt.

2. PICKLING

On this stage oxides that may have formed are eliminated in order to obtain a chemically clean Surface. Generally, pickling uses either hydrochloric acid or sulfuric acid.

3. USE OF FLUX

This salt (Zinc chloride and ammonium) protects the parts from oxidation after pickling, the thickness of the covering is proportional to the immersion time.

4. GALVANIZING

This operation is carried out by immersing the piece in a molten zinc bath at a temperature of approximately 450ºC (the coating thickness is proportional to the immersion time).

5. INSPECTION

Parts undergo an inspection with the purpose of verifying that the specifications requested by the client are met (Covering thickness).

SURFACE PREPARATION

In hot-dip galvanizing, iron or steel pieces are covered with a layer of zinc by immersion in a molten Zinc bath, heating up to a bath temperature of approx. 450 °C, the heat activates the reciprocal diffusion between iron and Zinc, which results in the formation of Fe-Zn alloy layers. When the parts are removed from the bath, the Fe-Zn alloy layer is covered with a layer of pure Zinc, thus normally forming a shiny, silvery layer, which partially shows on the surface the “flowery” patterns of Zinc crystallization.

APPLICATIONS:

  • Cattle raising, agriculture and food processing.
  • Construction of building, bridges, etc.
  • Industrial furniture, commercial, urban and highway.
  • Manufacturing and automotive industry.
  • Generation, transmission and distribution of electricity.
  • Transport
  • Water treatment system
  • Petroleum, petrochemical and chemical industry in general.
  • Naval Industry

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