Screw coating thickness detection method

In order to improve the hardness index of the hardware screw in the use process, it is necessary to coat the thickness of the screw before use. After the coating thickness 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, etc.

2. Magnetic method

The magnetic method of measuring 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. (Guide: Analysis of surface treatment types of fasteners)

3. 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.

4. Time flow method

The chronograph 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.

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