An aqueous organic silicone hydrophobic agent which was based on the matrix of a commercially available silicone emulsion and was prepared in the presence of a metal salt catalyst and a water soluble corrosion inhibitor of alcoholamine modified phytic acid was applied to treat A3 steel specimen. Factors such as the catalyst content, the modified phytic acid concentration, pH of the phytic acid solution and ratio of the emulsion to the phytic acid acting on water-repellent treating effect and stability of the hydrophobic agent were examined. Effect of the hydrophobic agent on the water-repellency under the process parameters such as different heat-treatment temperatures, dipping time and heat-treating time was discussed and the appropriate formula and procedure were determined as well. The results demonstrate that the contact angle of the said hydrophobic agent treated specimen is as high as 132°, while the corrosion resistance of the phosphatized steel surface after treatment by the said hydrophobic agent is enhanced obviously.
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