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(Surface Prep) Don’t Let Your Eyes Deceive You

Picture for Coatings + Proceedings 2021-ALL Papers
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A steel surface has been properly prepared to a white metal blast and it looks great … to the naked eye at least. But is it? Why is a surface that has the correct profile and appears to be perfectly clean typically not good enough? A standard abrasive blast will give you the profile and visible cleanliness, but how clean is it? Testing is the only way to determine. That is testing for conductivity, chlorides, and any other contaminants.

Product Number: 67-COAT_DEC21
Author: Kenneth E. Rossy / Alexander J. Petkas,
Publication Date: 2021
Industry: Coatings
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$20.00
$20.00

A steel surface has been properly prepared to a white metal blast and it looks great … to the naked eye at least. But is it? Why is a surface that has the correct profile and appears to be perfectly clean typically not good enough? A standard abrasive blast will give you the profile and visible cleanliness, but how clean is it? Testing is the only way to determine. That is testing for conductivity, chlorides, and any other contaminants. And to be sure that the blasting is not leaving new contaminants, the abrasive and water may need to be tested too. These are testing steps are typically not taken unless specifically called for in a job scope. But best practices require that they should be as they eliminate potential failure that leads to redoes and contractor reputation damage.
How do you remove the salts and contaminants that testing revealed? Either with wet abrasive blasting or pressure washing after dry abrasive blasting with the addition of a chemical rinse aid in the water to fully clean the surface. Test again and prove to yourself that the surface is now much cleaner than previously thought. This provides the owner a better coating job, improves corrosion protection and allows the contractor to look like a hero.

A steel surface has been properly prepared to a white metal blast and it looks great … to the naked eye at least. But is it? Why is a surface that has the correct profile and appears to be perfectly clean typically not good enough? A standard abrasive blast will give you the profile and visible cleanliness, but how clean is it? Testing is the only way to determine. That is testing for conductivity, chlorides, and any other contaminants. And to be sure that the blasting is not leaving new contaminants, the abrasive and water may need to be tested too. These are testing steps are typically not taken unless specifically called for in a job scope. But best practices require that they should be as they eliminate potential failure that leads to redoes and contractor reputation damage.
How do you remove the salts and contaminants that testing revealed? Either with wet abrasive blasting or pressure washing after dry abrasive blasting with the addition of a chemical rinse aid in the water to fully clean the surface. Test again and prove to yourself that the surface is now much cleaner than previously thought. This provides the owner a better coating job, improves corrosion protection and allows the contractor to look like a hero.

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(Inspection) What Do You Really Need to Know to be a Good Coatings Inspector?

Product Number: 60-COAT_DEC21
Author: William D. Corbett
Publication Date: 2021
$20.00

The role of a Coating Inspector has evolved considerably over the past few decades, and the responsibilities have increased over what used to be a rather straightforward job: to verify that surface preparation and coating application meet the project specification requirements. Today there are week-long or multi-week basic and advanced coating inspection courses, specialty courses that are industry-specific (e.g., bridge, nuclear), courses that are substrate-specific (e.g., concrete coatings inspection) and even coating-specific (e.g., inspection of thermal spray coatings). 
Picture for Coatings + Proceedings 2021-ALL Papers

(Coating Application, Types & Characteristics) Use of Duplex Coating Systems for Protection of Structural Steel

Product Number: 15-COAT_DEC21
Author: William D. Corbett
Publication Date: 2021
$20.00

The use of duplex coating systems (hot dip galvanizing or thermal spray coating with one or more liquid-applied coatings) for long term protection of structural steel is becoming more mainstream in many industries. This paper describes the advantages of employing duplex coating systems as well as some important considerations for designers prior to specifying their use. It also highlights an ongoing initiative to help agencies more efficiently and effectively use duplex coatings on steel bridges by developing guidelines, standards, and other materials.
Picture for Coatings + Proceedings 2021-ALL Papers
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(Coating Formulation) Can Low Zinc Epoxy Primers Work as Well as Traditional Zinc Rich Epoxy Primers

Product Number: 47-COAT_DEC21
Author: Alex Yagüe / Pinturas Hempel / David Morton
Publication Date: 2021
$20.00

Zinc-rich primers, with zinc dust loadings of 80-85% by weight in the dry film, are often the preferred primer during new construction of assets placed in environments with high atmospheric corrosivity. Coating standards such as SSPC-Paint 20 and ISO 12944 demand that zinc-rich primers contain at least 65% and 80% zinc dust by weight in the final dry film, respectively. Traditional zinc rich primers need this high zinc loading to achieve galvanic protection of steel. New technology allows us to develop zinc primers with a lower content of zinc and/or different zinc morphology than dust to provide similar or better corrosion protection to the steel.
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