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Steel choice

The choice of steel is not irrelevant. It matters to the final result.

The choice of steel is not irrelevant. It matters to the final result.

The silicon contents of steel not only affect the thickness of the zinc film but also ultimately the quality of the delivery. DOT is aware of this - which is why the customer should know the silicon contents to have their requirements and wishes for the film thickness after galvanizing fulfilled.

Learn more about silicon
Design

The small design details are important.

The small design details are important.

That's why we would like to be your partner. The small details in hot-dip galvanizing are often:

  • Holes must be included for venting and as zinc outlets
  • Relief holes must be included in all reinforcing plates
  • Holes must be included in welded plates
  • Lifting lugs must be included on heavy items
  • Cut edges must be rounded

Read more about holes, drains and design.

In painting and metallization, the small details are often:

  • Lifting lugs may be included on heavy items
  • Cut edges must be rounded
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Preparation

DOT provides advice and instructions from the project stage.

DOT provides advice and instructions from the project stage.

The steel surface may have many impurities or deposits such as paint, lacquer, oil, grease, welding slags or weld spatter which cannot be removed in a normal cleaning process.

DOT is happy to provide guidance from the project stage as the more aesthetic quality is important to ensure that the item is smooth and without any visible errors - in particular when special requirements exist regarding appearance, smoothness or the material's function after the hot-dip galvanizing.

The deposits or impurities are assumed to have been removed before delivery of the item unless a prior agreement has been made with DOT regarding cleaning.

A prior agreement should also be made when items with old zinc coatings are delivered as their removal involves additional costs. This also applies to steel items with particularly severe corrosion (pitting corrosion), paint, lacquer, etc. which must be removed by abrasive blast cleaning or other mechanical cleaning.

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The location of holes and the size of the holes in the designs are crucial parameters to ensure a high surface quality of the end product

Lars Jensen,
Plant manager, DOT

Repairs

It is important that the corrosion protection is intact. If not, it has to be repaired.

It is important that the corrosion protection is intact. If not, it has to be repaired.

Hot-dip galvanizing of steel and the use of hot-dip galvanized steel mean that coating damage must be repaired.

This may be necessary in connection with welding, other finishing or in peeling arisen during inappropriate transport and handling.

DOT offer repairs based on one of the following three methods:

  • Zinc spraying
  • Application of a zinc-rich primer
  • Application of low-melting zinc solder

 

The appropriate method depends on the corrosion environment and the impacts, etc. to which the hot-dip galvanized designs will later be exposed.

The objective is of course that the corrosion protection will not be reduced compared to the original hot-dip galvanizing and that it at least complies with DS/EN ISO 1461.

Learn more about repairs
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