The features of wear scar surface and the element composition of the surface film were analyzed by SEM and XPS. The interactions between the additives were preliminary discussed.
采用SEM和XPS对磨斑表面的形貌和表面膜的元素组成进行了分析，对添加剂之间的相互作用进行了初步的探讨。
The preliminary research showed that the material used of the piston rod is unqualified , casting aliquation and much S element result in cracking on the edge of the casting aliquation.
结果表明，断裂的原因是材质不合格，存在成分偏析，热处理工艺不符合规定以及硫元素含量偏高。
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