A theory of anti-squawk additive behavior was formulated based on diffusion and boundary lubricant formation. Friction tests were run with common friction surfaces in a common white paraffin oil containing different anti-squawk additives and analyzed to evaluate the theory. The data indicated dynamic friction was diffusion controlled at any given additive concentration. Additive concentration was not controlling dynamic friction at concentrations above 0.001 moles per liter, although the dynamic frictional behavior of zinc stearate solutions was concentration dependent below 0.001 moles per liter. Static friction data for zinc stearate followed a Langmuir adsorption isotherm. Friction changes caused by boundary lubricants were proportional to the amount of boundary lubricant on the friction surfaces.
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Clarence E. Albertson (1963) studied this question.
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