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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.
There are many products which protect structural steel from corrosion. There is also an intense focus on sustainability. Hot-dip galvanizing is one product that provides economical, long-lived, and sustainable corrosion protection. It is also more durable than most other barrier systems. Not all steel can be galvanized because sometimes the elements are too long and/or too heavy to be placed in the baths.
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Hot-dip galvanizing is one of the most economical, maintenance-free corrosion protection systems available. Like any other manufacturing process, hot-dip galvanized steel requires an inspection of the finished product to ensure compliance with applicable specifications. In this presentation, we will discuss the inspection process completed at galvanizing facilities prior to final shipment.
Performance properties of solvent-based urethane topcoats formulated with fluorinated polymers are reviewed. Fluoro-urethanes offer outstanding gloss and color retention, good chemical resistance, and excellent adhesion. The long coating service life of fluoro-urethanes reduces the frequency of maintenance work and subsequent downtime interruption.