Abrasion And Corrosion Behavior Of Wear Resistance Steel In Slurry Transportation

This paper mainly investigated the abrasion and corrosion behaviorof one martensite wear resistance steel in3.5wt%NaCl slurry with highconcentration quartz sands by comparing with one carbon structural steel.First, we contrasted the abrasion and corrosion data in actual workingcondition and in our experiment, and we found that these results kept wellconsistent. This indicated that our experimental condition and plan werevisible. Then, through changing the corrosive environment and velocity,we studied the abrasion and corrosion rate and the worn surface of twosteels. We also studied the synergism in abrasion and corrosion.With the corrosive environment changed from alkaline to neutral,acid condition, the abrasion and corrosion rate increased for two steels.The relative abrasion and corrosion rate for wear resistance steel was47.18%、57.48%、60.06%. This was mainly because that the corrosionresistance ability of wear resistance steel was weaker but the corrosiveenvironment deteriorated. Besides, the morphology of wear Resistancesteel changed from plowing pits, abrasive pits to more abrasive pits, thediameter of abrasive pits was about50μm. The morphology of carbon structural steel changed from extrusion edges, abrasive pits and uniformabrasion respectively, the diameter of abrasive pits was about80μm.With the velocity changed from1.1m/s to2.2m/s,3.3m/s, theabrasion and corrosion rate both increased while the relative ratedecreased first and increased later. The morphology of wear Resistancesteel changed from no abrasive pits and little erosion and corrosion, toabrasive pits, to more abrasive pits. The diameter also changed from50μm to90μm. The morphology of carbon structural steel changed fromlittle abrasive pits, to more abrasive pits, to little microcracks. Thediameter of pits changed from50μm to90μm. The length of themicrocracks changed from20μm to80μm.In the alkaline to neutral, acid condition, the abrasion and corrosionsynersim of two steels kept positive. This indicated that corrosion andabrasion accelerated each other’s effect. Pure abrasion occupied a largerproportion, this indicated that abrasion was the main reason in theseconditions. The abrasion and corrosion rate of wear Resistance steel waslower. This was because of the above two reasons.Compared with the neutral condition, the synersim decreased in theacid slurry. This was paradoxical. While further stduy indicated that thetemperature was2℃lower than the neutral slurry. This could explain theabnormal phenomenon. In the alkaline slurry, the synersim decreased.This was because the corrosive effect was inhibited.