*4.6. The E*ff*ects of Processing Routes on Corrosion Behavior*

Comparing now the corrosion properties of all alloys with all their microstructures, including HPT and thermal treatments at 100 ◦C, it turned out that none of the treatments that produced vacancies/vacancy agglomerates, dislocations and grain boundaries, had a significant impact on corrosion properties. Even a 24 h heat treatment following the HPT-processing did not change the corrosion rate or led to its increase. It can be concluded that the corrosion rate is much more affected by the composition of the alloy. As a side result, even the implementation of IS state out of the as-cast state *decreased* the corrosion rates of all materials studied here. It is expected that the dissolution of primary precipitates decreases the corrosion rate by reducing micro-galvanic corrosion effects.
