When it comes to proper metallographic polishing, the first thing you need to do is make sure you have the proper equipment. If your metallographic polisher isn't getting the work done or is providing you with substandard results, it's time to replace your equipment. However, if your equipment is in good condition but you're still faced with substandard results, the problem may lie with the process. Here are four problems that can undermine the effectiveness of your test results. 

Unwanted Particles

When you conduct metallographic testing, you need to make sure that the polishing results are flawless for your specimen. Unfortunately, there may be times when your specimen will be contaminated during the testing process. When that happens, you may notice unwanted particles on your specimen. Those agglomerate particles are a sign that you have bacterial growth in your suspending agent. If that's the case, you'll need to discard the contaminated agent and start the process over again. 

Surface Residue

If your polished specimen has a matte finish or looks dull, there's a good chance that you're working with a dirty specimen. This can happen when the specimen isn't cleaned properly prior to polishing. However, this can also happen when the actual testing surface is contaminated prior to testing. If your specimen has a matte or dull finish, clean the testing surface with alcohol. If you receive the same dull results, you'll need to clean your specimen and polishing pad. 

Specimen Scratches

If you're noticing scratches on the surface of your specimen, you need to take action to resolve the issue. Scratches can undermine the results of your testing. Scratches can be caused by a variety of issues during the polishing process. Some causes include using the wrong polishing pads, using a contaminated pad, or not following the proper polishing procedures. To eliminate scratches, ensure that you're following proper procedures and that your polishing pad isn't contaminated. 

Surface Etching

Finally, if your metallographic polisher is leaving you with etching on your specimens, chances are good that you're using the wrong abrasive. Choosing an abrasive with the wrong pH level, especially one that's too high, could cause damage to your specimen. Before you continue with your metallographic polisher, make sure that you're using the proper abrasive for the specimen you're working with. 

Don't take chances with your metallographic polisher. If you're not receiving the results you need, use the guide provided above to identify the problem. To learn more, contact suppliers of metallographic polisher equipment.