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96354 MEASUREMENT OF CORROSION - WEAR PERFORMANCE

Picture for 96354 MEASUREMENT OF CORROSION - WEAR
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Product Number: 51300-96354-SG
ISBN: 96354 1996 CP
Author: F. J. Friedersdorf
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An electrochemical pin-on-disk corrosion-wear apparatus was developed at the US Bureau of Mines, Albany Research Center. The instrument was qualified using a low alloy steel (ASTM A514) and 304 stainless steel. The apparatus incorporate simple specimen and counterface geometry and is instrumented for simultaneous corrosion and wear testing. The electrochemical and wear parameters of potential, current, charge, sliding speed, frictional force and normal acceleration can be continuously displayed and recorded. After a break-in period, the electrochemical pin-on-disk produced constant wear rates independent of path length for both ASTM AS14 steel and 304 stainless steel. Results for 304 stainless steel in sulfate solutions showed that abrasive wear caused the corrosion potential to shift 400 mV in the active direction and the anodic current density to increase by 3 orders of magnitude, as compared to the condition of no wear. Current density was a linear function of the sliding speed at a constant applied anodic potential. The open circuit corrosion potential exhibited power law behavior with respect to the sliding speed. Volume loss and corrosion measurements showed that mechanical removal of material was responsible for 95% of the corrosion-wear of 304 stainless steel. Corrosion, however, increased the mechanical removal of material by 40%. Keywords: pin-on-disk, corrosion-wear, abrasive wear, stainless steel, potentiodynamic scan.
An electrochemical pin-on-disk corrosion-wear apparatus was developed at the US Bureau of Mines, Albany Research Center. The instrument was qualified using a low alloy steel (ASTM A514) and 304 stainless steel. The apparatus incorporate simple specimen and counterface geometry and is instrumented for simultaneous corrosion and wear testing. The electrochemical and wear parameters of potential, current, charge, sliding speed, frictional force and normal acceleration can be continuously displayed and recorded. After a break-in period, the electrochemical pin-on-disk produced constant wear rates independent of path length for both ASTM AS14 steel and 304 stainless steel. Results for 304 stainless steel in sulfate solutions showed that abrasive wear caused the corrosion potential to shift 400 mV in the active direction and the anodic current density to increase by 3 orders of magnitude, as compared to the condition of no wear. Current density was a linear function of the sliding speed at a constant applied anodic potential. The open circuit corrosion potential exhibited power law behavior with respect to the sliding speed. Volume loss and corrosion measurements showed that mechanical removal of material was responsible for 95% of the corrosion-wear of 304 stainless steel. Corrosion, however, increased the mechanical removal of material by 40%. Keywords: pin-on-disk, corrosion-wear, abrasive wear, stainless steel, potentiodynamic scan.
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