CORROSION RESISTANT PRIMER COATING

摘要

A corrosion resistant primer coating comprises one or more corrosion inhibiting additives; and one or more nonaqueous resins, and the method of making and using the primer coating. The corrosion inhibiting additive comprises metal ferrate(IV) compounds, metal ferrate(V) compounds, metal ferrate(VI) compounds, or a mixture thereof (collectively called the ferrate compound). The ferrate compound has a low solubility in water in the range of about 0.001 ppm to about 2000 ppm at a temperature in the range of about 0° C. to 71° C. A method of making the metal-1 ferrate compound suitable for the corrosion resistant primer coating comprises steps of (a) dissolving a highly soluble metal-1 salt in water, (b) dissolving and mixing an alkali metal ferrate compound and a metal-2 hydroxide in water, (c) adding the solution of step (b) to the solution of step (a) to form a preproduct, wherein the preproduct comprises the metal-1 ferrate compound; (d) filtering and washing the preproduct with one or more solvents to obtain the metal-1 ferrate compound; and (e) drying the metal ferrate compound in a low moisture environment to obtain the dried metal-1 ferrate compound; wherein the metal-1 ion and the metal-2 ion are the same or are different from each other.