ILZRO Classifications of Sandelin Steels

Research carried out by the University of Cardiff in Wales for ILZRO (International Lead Zinc Research Organization) project took an in-depth look at the problem of silicon reactivity and included phosphorous as a r...
Continue Reading »

Coating Thickness vs. Coating Weight

The usual criterion for determining the expected service life of zinc coatings is thickness: the thicker the coating, the longer the service life. This is an acceptable criterion when comparing zinc coatings produce...
Continue Reading »

Why does the galvanized coating thickness depend on the steel thickness?

The hot-dip galvanized coating is an intermetallic layer of iron and zinc, meaning the zinc and iron react and diffuse into one another to create the galvanized coating. If more iron is available to react with the z...
Continue Reading »

Can 4130 steel be successfully galvanized?

4130 steel is a chromoly steel. Steels of this chemistry have presented some adherence problems in the past when galvanized. The galvanized coating developed in some areas but not others. It would be best to try ga...
Continue Reading »

Is it possible to have steel with chemistry too good for galvanizing?

It is possible to have steel chemistry with levels of silicon and phosphorus that are too low to meet the minimum thickness levels specified in ASTM A123 and ASTM A153. Very low silicon levels are seen more often on...
Continue Reading »

Why is lead added to the galvanizing bath?

This content is only accessible to AGA Members with a current account. Find out how to become a member.
Members Only »

Does magnesium chloride corrode galvanized steel?

Magnesium chloride can aggressively attack many types of steel, including galvanized steel. Wet magnesium chloride is more aggressive than dry. Magnesium chloride should not be left on galvanized steel for prolonged...
Continue Reading »

Is there concern about galvanic corrosion when different types of zinc-coated steel are in contact?

There is not a concern of dissimilar metals corrosion (galvanic corrosion) when pairing zinc-coated steel of different types (for example when pairing a hot-dip galvanized bolt with a mechanically galvanized nut). P...
Continue Reading »

What types of metals will not galvanize?

There are many types of materials that will not develop a galvanized coating. Iron is necessary for a galvanizing reaction to happen, so if you try galvanizing copper or aluminum, they will not develop a galvanized...
Continue Reading »

Measuring Zinc Coating Thickness of Hot-dip Galvanized Steel

Coating thickness is tested by using a magnetic thickness gauge. There are three types of magnetic thickness gauges: pencil-style, banana-style, and electronic. Electronic thickness gauges are the most common and th...
Continue Reading »