油溶性防食添加剤に関する研究 (第1報) : ソルビタン部分エステルの防食性
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概要
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To study the influences of the polar groups of rust inhibitors upon the results of different corrosion tests, seven sorts of corrosion tests were carried out with sorbitan partial esters added in lubricating oils. The sorbitan partial esters used in these tests were six sorts of esters composed of mono and tri esters of lauric, stearic and oleic acids.<BR>The anti-corrosion properties of sorbitan partial esters were best shown in the shed storage test;and in the humidity cabinet test, the reaction test by potassium ferricyanide, and the salt water immersion test also, they were shown with fairly good effect. While in the sulfuric acid immersion test, the non-ferrous metal immersion test and the heat stability test, they did not present good results.<BR>It follows that sorbitan partial esters may be suitable for the additives to usual rust preventive oils, yet unsuitable when used in an acid atmosphere or in such a circumstance as is subject to oxidization at high temperature. They are liable to cause the discoloration of non-ferrous metal ; especially they badly corrode lead.<BR>The rust preventive properties of sorbitan partial esters vary to a high degree according to the sorts of the fatty acids linked rather than the number of the radicals of the fatty acids. Through all the corrosion tests conducted it was found that the best of all was oleate. This is, it can be said, because laurate and stearate have poor solubility to mineral oils as compared with oleate. It can be further said to be natural that oleate is superior to laurate and stearate because of the better adsorption of the moleculer film of oleate to metal surfaces.<BR>In measuring displacement energy, laurate showed almost as much minus value as oleate, yet in the humidity cabinet test or in two or three other corrosion tests laurate was inferior to oleate. It can be further understood that this is due to the fact that the chain of oleate is unsaturated and is longer and more hydrophobic than that of laurate.
- 社団法人 日本油化学会の論文
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