In oil and gas production the mainly used steel grades are carbon steels and low alloyed steels. Corrosion is one of the primary causes for failures, and leads to high costs. In many cases inhibitors are the most economic instrument for corrosion control. Important is the selection of the inhibitor, adjusted for the intended purpose. The aim of this work was to investigate the effectiveness of two different inhibitors (amin based respectively imidazoline based) against erosion corrosion of a low alloyed carbon steel. In the test facility, based on the jet impingement method, a high velocity fluid jet (30 m/s) impinges the specimen and causes material loss. The influences of the impact angle and the addition of solid particles (sand) were evaluated. Additional the protective effect of the inhibitors on weld joints was observed. The results show, that both inhibitors provide effective protection for the basic material and the weldments, also sand creates no negative effects.