Are there other metallurgical issues of concern, e.g. hydrogen embrittlement, intergranular attack, etc.?
On hydrogen embrittlement: not an issue with ECM On intergranular attack: which is the preferential ECM-ing (or attack) of the grain boundary on the surface of a workpiece, can occur on chrome bearing materials (such as stainless steel) and titanium, if improper parameters are used. The greatest concern of intergranular attack is when sodium chloride electrolyte is used because the chlorine ion can be the cause of grain boundary attack.
