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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.
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. Also, at times the intended environment is not conducive for zinc longevity such as acidic environments or immersed in salt water. But for those applications where galvanizing is appropriate, why would anyone not choose to hot-dip galvanize steel?
Engineers, architects, DOTs, and other specifiers use hot dip galvanizing to provide corrosion protection to steel and iron in many industries, including transportation and highway, parking garages, bridges, structural, agricultural, petrochemical, and original equipment manufacturing. To ensure continued corrosion protection and structural integrity in these industries, it is necessary to properly inspect the galvanizing.
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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.
Hot dip galvanizing steel articles after fabrication is one of the most widely used methods to provide corrosion protection. As a final step in the process, the hot dip galvanized coating is inspected for compliance with specifications. Correct measurement techniques and accurate interpretation of the results are necessary to provide an acceptable hot dip galvanized coating.