Patent ID: 7935274

Claim:
A composition for forming a coating on a metal surface, the composition comprising a phosphonic acid, polyvinyl alcohol, water, and a catalyst selected from the group consisting of group IV-B compounds, boron compounds, vanadium compounds, and molybdenum compounds, wherein the composition has a pH between 3.5 and 6.5 and a nonvolatiles content in a range from 0.007 wt % to 3.52 wt %, contains less than 500 ppm in total of alkali metals, and is essentially free of insoluble species, and wherein the phosphonic acid is selected from the group consisting of aminomethylphosphonic acid, vinylphosphonic acid, phosphonosuccinic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid and polyphosphonic acids.