Effect of Anti - Rust Oil Compositions on the Appearance of Bearing Rings After Salt Quenching

In order to solve the problem of yellow spots on the surface of the bearing ring after salt quenching caused by the residue of anti - rust oil on the bearing ring, the anti - rust oil additives on the market were screened. It was found that barium dinonylnaphthalene sulfonate (T705) and barium petroleum sulfonate (T701) could easily cause the yellow spots and the bearing ring became yellow seriously; while dodecenyl succinic acid (T746), calcium dinonylnaphthalene sulfonate (T705C),calcium petroleum sulfonate and compounding agent No.1, 2 and 3 did not lead to yellow spots. Results of elemental analysis showed that the additive with high barium contents produced the yellow spots. Through SEM analysis, the yellow spots on the surface of the bearing ring were caused by the attached anti - rust oil additive affecting the oxidation degree of the bearing ring surface, resulting in color difference.