What are the testing methods for stainless steel screws

Stainless steel screws usually refer to steel screws that have the ability to resist corrosion from air, water, acid, alkali salts, or other media. Stainless steel screws are generally not easy to rust, practical, and can be used in industries such as environmental protection equipment and communication equipment. For purchasers, it is important to inspect the quality of products. How to test stainless steel screws? Let's learn together below. The following points:

1、 Measuring method: The amount used includes micrometers, vernier calipers, plug gauges, etc

2、 Magnetic method: The magnetic method is used to measure the thickness of a coating layer, which is a non-destructive measurement of a non-magnetic coating layer on a magnetic substrate using a magnetic thickness gauge

3、 Microscope method: Place the corroded stainless steel screw fasteners on a metallographic microscope with a micrometer eyepiece to magnify and measure the thickness of the coating on the cross-section

4、 Timing flow method: Inject a solution that can dissolve the coating onto the local surface of the stainless steel screw on the coating, and calculate the thickness of the coating based on the time required for the local coating to dissolve completely