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FREQUENTLY ASKED QUESTIONS

The following is a list of questions commonly asked by our clients. Please contact us if you have a question about our process that is not answered below.


GALVANIZING PROCESS

Q:  Why Zinc?
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Zinc is a natural and abundantly available element that has been used in construction for millennia. Zinc metal has a number of characteristics that make it a well-suited corrosion protective coating for iron and steel products.

Q:  Is Hot-Dip Galvanizing (HDG) environmentally safe?
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Yes. Coating steel with zinc through the hot-dip galvanizing process protects it from corrosion, with minimal environmental, economic and social impacts. Not only does hot-dip galvanizing provide decades of maintenance-free longevity, but its primary components, zinc and steel, are natural, abundant, and 100% recyclable, making hot-dip galvanized steel an infinitely renewable building material.

Q:  Is Hot-Dip Galvanizing (HDG) cost efficient?
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When compared to other types of products labeled anti-corrosive and subject to environmental standards, HDG costs have risen at a slower pace. Considering the low or no-maintenance costs associated with HDG steel, the life-cycle cost analysis is positive.

Q:  Does Corbec Ontario meet industry standards?
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Yes. Corbec Ontario uses standards and processes that meet the specifications for hot-dip galvanizing issued by the Canadian Standards Association (CSA) and the American Society for Testing and Materials (ASTM). The test results and certificates of compliance for selected specifications are also available, provided the request is made on the original order, delivered before galvanizing.

Q:  Are there any size limits to what Corbec Ontario can galvanize?
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There are limits to the size of piece that can be accommodated in our kettles, however, it is best to contact us and we can discuss options and solutions. Double-dipping is a progressive immersion procedure for parts that are too large for in a single dip in the kettle. This procedure cannot be used to obtain additional coating.

Q:  Why does the zinc layer appear brighter in some areas and not others?
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The chemical composition of the steel used largely determines the final appearance of the galvanized product and the thickness of the coating. Steels produced by foundries have a wide range of compositions, and consequently, the galvanizing results differ.

Q:  How is distortion minimized?
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Distortion is relative to the thickness of the selected steel and can be minimized by selecting steel no thicker than 1/16”.

Q:  What is white rust and how can it be avoided?
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This term is often used incorrectly instead of the more common term "wet storage stain", which is a slight corrosion and much less serious than white rust. Storage stains can be avoided by storing freshly galvanized steel according to guidelines, avoiding exposing unprotected surfaces to moisture or water, or by applying a surface passivation treatment. These spots will disappear once the galvanized steel is exposed.

Q:  Why do I have to vent my material?
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The ventilation holes are required to enable the full flow of liquid when cleaning and during galvanization. Since the material must be fully protected, zinc must circulate freely in all cavities of a part or structure.

Q:  Is it possible to paint galvanized steel?
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Yes. Painting done according to standards will extend the service life of galvanized materials.

Q:  Is it possible to request a certain thickness of zinc
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No. The chemical composition of the steel and the condition of the surface will determine the thickness of the zinc coating. An increase in the thickness of the coating will only weaken the top layer of zinc and may result in flaking.

Frequently asked questions