Abstract
Several organo-phosphorus derivatives were synthesized from fatty acids and alcohols and their rust-preventive properties were examined by three corrosion tests, such as salt immersion test, out-door exposure test and humidity cabinet test.
As a result, the derivatives having free phosphonic or phosphonous acid group were hardly soluble in base oil, but when used together with sorbitanmonooleate, they dissolved in base oil and showed good rust-preventive properties. Especially, 9 (10) phosphonostearic acid, 9 (10) phosphonostearyl alcohol, 9 (10) - (hydroxyphosphinyl) stearic acid and 9 (10) - (hydroxyphosphinyl) stearyl alcohol were surpassing.
