1. When quenching the fasteners, use a silicate cleaning agent to clean up the impurities on them, and then rinse carefully to avoid leaving impurities on the fasteners, which will affect its normal application.
2. After the fastener is tempered, its color may change. After the fastener is soaked in ether for a period of time, an oily substance will be produced. Such a situation indicates that the fastener Not clean enough. After the analysis, it will be found that the stacking is not very reasonable when the fasteners are heated, and the fasteners may have some small oxidation phenomena in the quenching oil.
3. If there is a white substance on the fastener, it is likely to be some phosphide. The reason for this phenomenon is that the acid cleaner was not used for cleaning, and the rinse tank was not checked carefully enough.
