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Stainless steel screw inspection method
There are four main inspection methods for stainless steel screw fasteners:
1. Appearance quality requirements
The inspection of the appearance of stainless steel screws is carried out from the appearance, plating layer and other aspects.
2. Inspection of Screw Coating Thickness
1. Measuring tool method: The amount used includes micrometer, vernier caliper, plug gauge, etc.
2. Magnetic method: The magnetic method measures the thickness of the coating layer, which is a non-destructive measurement of the non-magnetic coating layer on the magnetic substrate with a magnetic thickness gauge.
3. Microscopy: the microscopy method is called 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. Timing liquid flow method (Guide: Eliminate the three major problems of anchor bolts)
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.
3. Inspection of the adhesion strength of the screw coating
There are many methods to evaluate the adhesion of the coating to the base metal, usually the following.
1. Friction polishing test;
2. File method test;
3. Scratch method;
4. Bend test;
5. Thermal shock test;
6. Extrusion method.
IV. Inspection of corrosion resistance of stainless steel screw coating
The corrosion resistance test methods of the coating include: atmospheric exposure test; neutral salt spray test (NSS test); acetic acid salt spray test (ASS test), copper accelerated acetic acid salt spray test (CASS test); and corrosion Paste corrosion test (CORR test) and solution spot corrosion test; immersion test, inter-immersion corrosion test, etc.
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