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Daily Quiz (13)

True or false: In hot-dip galvanizing, the coating forms four distinct layers.

True or false: Bimetallic corrosion, such as that which results when two dissimilar metals are connected electrically in a water tank interior, occurs most rapidly when the two metals are close together rather than far apart in the galvanic series.

True or false: Like hot-dip galvanizing, thermal-spray zinc coatings produce an iron-zinc alloy at or near the surface of the steel substrate being coated, according to a recent JPCL article.

True or false: The application of a coating to stainless steel that is electrically connected to carbon steel in immersion service can reduce but cannot completely eliminate the effects of galvanic corrosion, according to a recent JPCL article.

How is film build normally achieved during the thermal spray process?

What is a term used to describe the accelerated oxidation of galvanized steel caused by exposure to relatively high concentrations of moisture and oxygen trapped between pieces or sheets of steel that are closely stacked?

True or false: According to a recent JPCL article, a thermal-spray metal protective film is more similar to hot-dip galvanizing than to a liquid-applied coating.

True or false: Arc-spray application of thermal-sprayed metal coatings is conducted only in the shop.

True or false: Organic zinc-rich coatings are not recommended for the repair of galvanizing.

True or false: To be effective, a seal coat over a thermal-sprayed zinc coating must be applied after a significant amount of natural oxidation has occurred.

True or false: A seal coat should be applied over a thermal-sprayed zinc coating before oxidation occurs on the surface.

True or False: Both zinc and aluminum are used as thermal spray materials for corrosion protection of steel.

Who publishes the Specification for the Application of Thermal Spray Coatings (Metallizing) of Aluminum, Zinc, and their Alloys and Composites for the Corrosion Protection of Steel?


NACE International, The Corrosion Society
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