| Popis: |
Lubricating oil additives are expected to perform in the presence of polar organic compounds in functioning lubrication system. The present study deals with the influence of polar solvent on the adsorption phenomena of DNNS and other additives on metal surfaces using ellipsometry. The results show that BaDNNS film adsorbed on gold surface from n-hexane solution is not easily desorbed with n-hexane, whereas the film is desorbed with acetone. The same result was obtained with CaDNNS; succinimide dispersant is not easily desorbed by acetone rinse. The same tendency was obtained with chromium, and iron alloy. On the other hand, when Ba-DNNS is adsorbed from acetone solution on gold surface, the adsorbed film consists of two layers, that is, one is easily desorbed with acetone and the other is not. The contact angle measurement suggests that the adsorbed film of BaDNNS from n-hexane solution is different from that for acetone in orientation. The adsorption behavior of BaDNNS on gold from mixed n-hexane/1-propanol solution is different from that on carbon black. |
