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Friction, Lubrication, and Wear Technology (1997) Part 5

Tham khảo tài liệu 'friction, lubrication, and wear technology (1997) part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | calomel electrode. This system used a recycled slurry that was replenished with fresh slurry periodically to minimize the effects that were due to slurry particle rounding. At jetting speeds ranging from 9.3 to 21.5 m s 30.5 to 70.5 ft s the T C W from both a high-carbon steel and a high-chrome cast iron impinged by a quartz slurry were mainly influenced by the 5 C W . This synergistic effect accounted for 8.3 to 54.9 of the total material losses with the greatest effect occurring for larger particles and higher jet velocities. Closed-Loop Pipeline Experiments. Postlethwaite et al. Ref 26 measured the electrochemical corrosion rate of steels in a closed-loop pipeline experimental apparatus. He mounted electrode specimens flush with the pipe wall. The test section of pipe was a 38 mm 1.5 in. diam vertical leg of the test loop. The vertical orientation of the pipe eliminated any effects of gravity on the solids concentration in the pipe. The value for T C W was obtained by weight losses whereas Cw was obtained by polarization resistance techniques. The values obtained for W0 during cathodic protection of the electrode were less than 5 of the total material losses and 5 C W varied between 2.8 and 40.9 of the total material losses. Most of the material losses from a commercial carbon steel pipe were due to electrochemical corrosion. Depending on the slurry flow rate Cw varied from 56 to 92 of the T C W . It was shown that the erosive effect prevented the formation of a rust film that normally stifles the diffusion of oxygen to the corroding surface. Grinding Wear Systems The abrasive wear in grinding is different from that experienced in slurry particle impingement systems because the abrasive particles from the crushed ore participate in three-body abrasion between two solid surfaces. Rotating Cylinder Anvil Experiments. Kotlyar Pitt and Wadsworth Ref 36 used a rotating cylinder anvil apparatus to measure the corrosive wear of a HCLA steel. The apparatus consisted of