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The efficiency for a steel specimen

December 14, 2020

The efficiency for a steel specimen immersed in a phosphating tank is the weight of the phosphate coating divided by the metal loss (both in mg/ft2). An article gave the accompanying data on tank temperature (x) and efficiency ratio (y).
Temp. 171 173 174 175 175 176 177 178
Ratio 0.74 1.21 1.38 1.09 …