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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.
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Since ductile iron (DI) pipes generally cannot be galvanized, inorganic zinc (IOZ) coatings can be considered to provide sacrificial corrosion protection in harsh atmospheric exposures, such as marine environments. The unique application of IOZ coating system provides an excellent cost-effective, long-term protection of atmospherically exposed DI pipes.
Life safety is the mantra of National Fire Protection Association (NFPA) 101 which is embraced by all in the fire protection industry. The approach to life safety has disseminated now into steel protection. Hot dipped galvanized members are being used more frequently in commercial buildings which require hourly ratings for fire protection.
This paper will cover understanding the hot-dip galvanizing process and coating benefits, Identify the benefits of utilizing paint/powder coating with hot-dip galvanizing in a duplex system, Recognize the importance of communication and clear assignments of responsibility in the specification of successful duplex systems and differentiate between HDG surface conditions in order to properly prepare the zinc coating for paint/powder.
The polarity of the zinc-steel galvanic couple in hot aqueous solutions was published more than 20 years ago. It used an inorganic zinc primer coating that was applied under thermal insulation at elevated temperatures [30C-60C (86F-140F)]. Since the year 2000, industrial practices or standards do not recommend using inorganic zinc rich coatings under thermal insulation. Research has showed over the years that good practice of corrosion prevention under insulation is to apply an additional layer of a heat resistant modified epoxy or inorganic polymer coating as an additional barrier.
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.