A New Dimension in Phosphating

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Abstract
Conventional phosphating systems are compared with a new process by a résumé of the applications, eg pre-paint treatment, anti-corrosion properties, lubricant retention, and with the emphasis on the space saving and reduction in pollution problems provided by the new technique. The high volume wet blasting technique, its development and working principles are described. Phosphating theory and coating formula with particular reference to crystal structure and adhesion are explained. Evidence in support of the benefits to be obtained from a metal surface cleaned by a controlled blasting technique is detailed, including a comparison with chemical cleaning and conventional zinc phosphate. Experiences with iron, manganese, zinc, and lead phosphates are described. The influence of type of chemical, type of abrasive used, and the velocity of application, upon the crystal structure have been explored. Results of standard corrosion, paint adhesion, and mechanical strength tests are included.

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