In order to improve the hardness index of the screw during use, Custom China Fasteners Suppliers needs to coat the thickness of the screw before use. After the thickness of the coating is completed, how do we need to check whether the quality is in compliance? China standard parts network shares four detection methods .
1. Measuring tool method
The amount used includes micrometer, vernier caliper, plug gauge and so on.
- Magnetic method
The magnetic method to measure the thickness of the coating layer is a non-destructive measurement of the non-magnetic coating layer on the magnetic substrate with a magnetic thickness gauge.
- Microscopy
The microscopy method is called the metallographic method, which is to magnify the etched fasteners on a metallographic microscope with a micrometer eyepiece to measure the thickness of the coating on the section.
- Timing sap flow method
The Full Threaded Stud Factory timing flow method is to use a solution that can dissolve the coating on the partial surface of the coating, and calculate the thickness of the coating according to the time required for the partial coating to dissolve. There are also plating spot method, anode dissolution coulometric method and so on.
