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Inspection, Touch Up, & Repair of Hot-Dip Galvanizing

Inspection, Touch Up, & Repair of Hot-Dip Galvanizing
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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. 

Product Number: 51219-221-SG
Author: Kenneth Tator
Publication Date: 2019
Industry: Coatings
$0.00
$20.00
$20.00

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. This includes ASTM specifications and protocol for coating thickness, adherence testing, and visual inspections. The appearance of hot-dip galvanized coating can vary from piece to piece, and even section to section of the same piece. Furthermore, there are various surface imperfections that may be present. Some imperfections do not lessen the long-term performance of the piece, while others do decrease the life are rejectable according to the specifications. We will discuss how to differentiate benign surface imperfections from malignant imperfections and the process to remedy rejectable parts. The touch-up and repair of hot-dip galvanized coatings is important to maintain uniform barrier and cathodic protection. Although the hot-dip galvanized coating is very resistant to damage, small voids or defects in the coating can occur. We will review the three acceptable forms of touch up & repair called out in ASTM A780. Zinc, like all metals, begins to corrode naturally when exposed to the atmosphere. However, zinc corrosion products actually form a tenacious, abrasion-resistant patina that helps to provide hot-dip galvanizing with its long service life. We will conclude our presentation by discussing the proper storage and handling required to ensure the development of the zinc patina is not disrupted.

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. This includes ASTM specifications and protocol for coating thickness, adherence testing, and visual inspections. The appearance of hot-dip galvanized coating can vary from piece to piece, and even section to section of the same piece. Furthermore, there are various surface imperfections that may be present. Some imperfections do not lessen the long-term performance of the piece, while others do decrease the life are rejectable according to the specifications. We will discuss how to differentiate benign surface imperfections from malignant imperfections and the process to remedy rejectable parts. The touch-up and repair of hot-dip galvanized coatings is important to maintain uniform barrier and cathodic protection. Although the hot-dip galvanized coating is very resistant to damage, small voids or defects in the coating can occur. We will review the three acceptable forms of touch up & repair called out in ASTM A780. Zinc, like all metals, begins to corrode naturally when exposed to the atmosphere. However, zinc corrosion products actually form a tenacious, abrasion-resistant patina that helps to provide hot-dip galvanizing with its long service life. We will conclude our presentation by discussing the proper storage and handling required to ensure the development of the zinc patina is not disrupted.

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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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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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This paper provides an introduction to the hot-dip galvanization process as an effective and important coating option and the necessary surface preparation steps for successful painting over hot-drip galvanized steel, also known as a duplex system. Proper practices and procedures must be used to prepare new and weathered zinc-coated surfaces on after-fabrication steel products for painting to improve the bond of paint to the zinc surface and provide long-term protection against corrosion.

 
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