Inorganic phosphate corrosion resistant coatings

A method of providing corrosion protection to a metal surface, the method comprising:

• contacting a metal surface with a first component and a second component, in any order or in combination;
• wherein the first component comprises an aqueous mixture of suspended, dispersed, or slurried particles of an acid-phosphate of chemical formula Am(H2PO4)m.nH2O, where A is hydrogen ion, ammonium cation, metal cation, or mixtures thereof;
• where m=1-3, and n=0-6 adjusted to a pH of about 2 to about 5, wherein the particles of the acid phosphate have an average particle size of less than 30 microns, and about 90 percent of the particles of the acid phosphate have a particle size distribution of less than 30 microns;
• and
• wherein the second component comprises an aqueous mixture of suspended, dispersed, or slurried particles of an alkaline oxide or alkaline hydroxide represented by B2mOm, B(OH)2m, or mixtures thereof, where B is an element of valency 2m where m=1, 1.5, or 2 adjusted to a pH of between 9-14 and
• configured for combination and at least partial reaction with the first component to provide a phosphate ceramic;
• and
• wherein the suspended, dispersed, or slurried particles of the acid-phosphate are present in an amount of at least about 60 wt % to about 80 wt % in the aqueous mixture thereof;
• providing corrosion protection to the metal surface.