Design

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Design

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Can I specify a thicker coating than normal?

Q: Can I specify a thicker coating than normal and if so, will I achieve a correspondingly increased lifespan for my steel? What is the way of increasing galvanising coating thickness? A: Current indications are that the normal coating thickness of 85 microns will protect most articles for well in excess of 40 years. [...]

By |2017-07-04T10:44:26+00:00November 22nd, 2016|Categories: Design, galvanizing|0 Comments

Batch Galvanized vs Pregalvanized Products

It is common misconception that any zinc coating can be termed as galvanizing but this is in fact not the case as there are many different processes by which a zinc coating may be applied. Hot Dip Galvanizing refers only to coatings formed by immersing steelwork into molten zinc. However, there are two variations [...]

By |2017-07-04T13:52:46+00:00November 11th, 2016|Categories: Design, galvanizing|0 Comments

Painting and Powder Coating on Hot Dip Galvanizing

A duplex coating is defined as a combination of two different coating systems which often complement one another, Typically this means a metallic coating overcoated by an organic system. Examples of such systems are hot dip galvanizing surfaces which have been painted or powder coated. Typically, a galvanized coating on its own will provide adequate [...]

By |2017-07-05T09:50:25+00:00November 11th, 2016|Categories: Design, Duplex Systems, galvanizing|0 Comments

Masking and Prevention of Hot Dip Galvanized Coating

When galvanizing a steel article, it may be desirable to prevent a coating from forming in certain areas which will have special functions such as: A threaded component on a fabrication Drilled holes Surfaces which will be subject to welding after galvanizing There are several different methods that may be used to prevent a [...]

By |2017-07-05T10:05:15+00:00November 11th, 2016|Categories: Design, galvanizing|0 Comments

Hot Dip Galvanized Castings

Galvanizing of castings is covered by EN ISO 1461:2009. Hot dip galvanizing of cast iron provides excellent protection from corrosion and the coating is applied by immersion in molten zinc at 450°C forming a tough, adherent coating which is bonded to the base metal by series of zinc-iron alloy layers overlaid with free zinc. If [...]

By |2017-07-05T10:18:24+00:00November 11th, 2016|Categories: Design, galvanizing|0 Comments

Avoiding Distortion During Hot Dip Galvanizing

In practice, cases of distortion during hot dip galvanizing are relatively infrequent. There are a number of important criteria that designers should keep in mind. Causes Distortion occurs due to the relief of locked-in stresses within a steel section or fabrication. At room temperature, the steel is sufficiently strong to accommodate such stresses, but [...]

By |2017-07-05T11:09:14+00:00November 11th, 2016|Categories: Design, galvanizing|0 Comments

Considerations before Hot Dip Galvanizing: Handling During the Process

Hot dip galvanizing is the process of coating iron or steel articles with a layer of zinc by immersing the metal in a bath of molten zinc at a temperature of around 450°C. There are many galvanizing plants within the UK and Republic of Ireland, all of whom offer a variety of galvanizing bath [...]

By |2017-07-05T11:31:05+00:00November 11th, 2016|Categories: Design, galvanizing|0 Comments

Filling, Venting and Drainage

It is important to bear in mind that the steelwork is immersed into and withdrawn from a bath of molten zinc at about 450°C. Thus any features which aid the access and drainage of molten zinc will improve the quality of the coating and reduce costs. Good design requires: means for the access and drainage [...]

By |2018-06-26T13:50:43+00:00August 30th, 2016|Categories: Design|0 Comments

A Guide to Hot Dip Galvanizing Standard EN ISO 1461 : 2009

The European and International standard covering post-fabrication hot dip galvanizing of steelwork I.S. EN ISO 1461 : 2009 Hot Dip Galvanized Coatings n Fabricated Iron and Steel Articles – Specifications and Test Methods, covers the galvanizing of steel fabrications, sections and castings in a bath of molten zinc containing a minimum of 98% zinc. The [...]

By |2017-07-06T09:04:52+00:00August 26th, 2016|Categories: Design, galvanizing|0 Comments

Considerations before Hot Dip Galvanizing: Steel Composition

During the hot dip galvanizing process, iron and steel components are heated to the temperature of the galvanizing bath, of about 450°C. While the steel is immersed in the molten zinc, layers on zinc-iron alloy are formed on the surface by a process of diffusion. When the steel components are withdrawn from the bath these [...]

By |2017-07-06T09:38:59+00:00August 26th, 2016|Categories: Design, galvanizing|0 Comments