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Don’t be Passive about Passivations

Don’t be Passive about Passivations
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The hot-dip galvanizing on steel components is a very reactive material that is often given a surface treatment to inhibit oxidation from exposure to moisture and other constituents in the atmosphere. These treatments are referred to as “passivation treatments” and are applied to the zinc surfaces during the quenching process or soon after and before the surfaces begin to oxidize.

Product Number: 41207-335-SG
Author: Brian Hanks
Publication Date: 2007
Industry: Coatings
$0.00
$20.00
$20.00

The hot-dip galvanizing on steel components is a very reactive material that is often given a surface treatment to inhibit oxidation from exposure to moisture and other constituents in the atmosphere. These treatments are referred to as “passivation treatments” and are applied to the zinc surfaces during the quenching process or soon after and before the surfaces begin to oxidize. These treatments are generally not expected to provide long-term protection of the zinc and therefore the galvanized steel is often specified to receive protective coatings to prolong the life of the zinc coating and to provide aesthetics.

The hot-dip galvanizing on steel components is a very reactive material that is often given a surface treatment to inhibit oxidation from exposure to moisture and other constituents in the atmosphere. These treatments are referred to as “passivation treatments” and are applied to the zinc surfaces during the quenching process or soon after and before the surfaces begin to oxidize. These treatments are generally not expected to provide long-term protection of the zinc and therefore the galvanized steel is often specified to receive protective coatings to prolong the life of the zinc coating and to provide aesthetics.

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Coating and Lining of Concrete requires an understanding of both new and existing concrete substrate conditions. New concrete must be evaluated for surface strength, cracking, and construction defects. In addition, existing concrete must be evaluated for mechanical damage, chemical contamination, and corrosion. Evaluation methods and equipment will be discussed.
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The first written record of galvanizing describes how a French chemist named Melouin presented a method of coating iron by immersing it in molten zinc to the French Royal Academy in 1742. Sorel, another French chemist patented a process for coating iron with zinc after preparing it with 9% sulfuric acid followed by fluxing with ammonium chloride. Great Britain granted a patent for a similar process in 1837. By 1850, galvanizing had become a generally accepted practice for the protection of iron and steel with 10,000 tons of zinc per year used for the protection steel.
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Significant quality control/quality assurance data is collected during industrial coating projects. Too often this data is surveyed for compliance with the contract requirements and then relegated to a file cabinet, never to be seen again. The paper highlights the types of coating inspection data collected and various “value-added” analyses which may be performed.
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