| abstract |
The present invention provides a lubricant that has rust resistance against both copper and SUS and that does not deteriorate its lubricity even when used for a long time. A lubricant comprising an electrolyte that is liquid at 40 ° C., a pH adjuster, and a rust inhibitor, and having a pH of 8.0 to 11.0 at 25 ° C. Is a salt of an aminidium cation and an anion having a pKa of 3 to 8. [Selection figure] None |