Does welding oxides need to be pickled before electropolishing?

The short answer is yes.

Pickling of welding oxides is necessary to achieve a good electropolishing result. There are several reasons for this.

 

Welding oxides cannot be eliminated by electropolishing. The oxide layer will block the electrical flow and the welds will be left untreated after electropolishing.

 

Electropolishing is sensitive to surface contamination. Oil, grease or other chemical residues on the surface can cause unwanted effects and, in these cases, pickling works as a cleaning process.

 

A pickled surface usually produces a much more even and smoother result after electropolishing. It can also reduce effects from previous machining.

You can compare with applying a primer before painting. It is not something that can be seen afterwards but if it is not performed, it will be noticeable.

 

If you want to know more about pickling and pre-treatment before electropolishing, please contact our sales department at sales@calamo.se