The zinc-rich primer is a cathodic protection type heavy-duty anti-corrosion coating, which is divided into inorganic zinc-rich primer and organic zinc-rich primer.
The inorganic zinc-rich primer includes both a water glass type and a hydrolyzed ethyl silicate type, and the former is used as a primer on a steel bridge. The water glass type inorganic zinc rich primer is also called an aqueous inorganic zinc rich primer.
Most of the waterborne inorganic zinc-rich primers used in China are secondary curing type. It is composed of sodium water glass (sodium silicate) and zinc powder. After the coating is formed into a film, a curing agent is applied to cure the coating. At present, China's railways have begun to use water-based self-solid inorganic zinc-rich coatings, which are mainly composed of potassium water glass and zinc powder. The coating can be fully self-cured within a few hours, not afraid of rain, greatly shortening the construction period. . It has been used in the newly built Qinshen Bus Line in China, such as Lilac Bridge and Yuhuai Line Changshou Bridge.
The organic zinc-rich primer is mainly an epoxy zinc-rich primer. Since the adhesion of the epoxy resin to the steel substrate is good, the amount is large.
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