HDGASA

Misconceptions

At the Association we strive to offer the best advice on hot dip galvanizing. Please click on any of the links below, which rectify incorrect impressions concerning hot dip galvanizing.

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Hot dip galvanizing of high strength fasteners is not recommended, due to the propensity for fracture as a result of hydrogen embrittlement
Discontinuations and Thin Areas on an Applied HD Galvanized Coating
Hot dip galvanizing provides both barrier and cathodic protection
Once rust stains appear on a weathered hot dip galvanized surface
The corrosion resistant life of a zinc coating is the same, regardless of the process by which it is applied.
Evidence of rust staining is a certain indication that a hot dip galvanized coating has reached the end of its protective life.
The galvanizer can play a major role in preventing the formation of undesirably thick hot dip galvanized coatings.
Specify HEAVY DUTY hot dip galvanizing or cadmium electro-plating for superior corrosion protection of fasteners
Hot dip galvanized surfaces are extremely difficult to overcoat with paint whether for aesthetic reasons or for additional protection.
If I require a thicker, and hence, more durable galvanized coating I must specify “double dipping” or, “double spelter”.
The hot dip galvanizing process has a detrimental effect on the strength properties of steel.
Zinc corrodes in the same way as steel.
Hot dip galvanized coatings provide a surface on which it is extremely difficult to apply paint.
The chemical analysis of steel determines the extent to which the Fe / Zn alloy layers in a hot dip galvanized coating grow during immersion in the molten zinc.
If you require a thicker hot dip galvanized coating you should specify it as C4 or C5 (in terms of ISO 9223) hot dip galvanizing.

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