Accession Number : ADA189603

Title :   Corrosion-Wear Process Under Rolling-Sliding Motion.

Descriptive Note : Final rept. 30 Aug 85-28 Feb 87,

Corporate Author : IIT RESEARCH INST CHICAGO IL

Personal Author(s) : Panda, Binayak

PDF Url : ADA189603

Report Date : Aug 1987

Pagination or Media Count : 104

Abstract : To advanced the understanding of the corrosion-wear process under rolling and rolling-sliding motion, a dynamic corrosion-wear electrochemical cell was designed and constructed. This cell is capable of monitoring the electrochemical behavior under simultaneously occurring corrosion and wear processes simulating naval aircraft bearings. With this test apparatus, complete polarization diagrams were obtained for various rolling and rolling-sliding conditions along with the corrosion current density and open-circuit potential of the system. Even under pure rolling conditions, the effect of wear was significant in removing the passive film, as indicated by the increase in corrosion current and decrease in open-circuit potential. Increase in load and introduction of a few percent sliding generated more severe wear conditions, reflected in the results of electrochemical measurements. Results from the statistical analysis of the tests based on the Plackett-Burman test matrix indicated that more than one variable exerts significant influence on the electrochemical parameters. Addition of 500 ppm sodium dichromate into the electrolyte was the most significant factor statistically. A combination inhibitor consisting of 500 ppm sodium nitrite and 500 ppm sodium dichromate had the most dramatic effect in reducing corrosion in the absence of lubricating oil.

Descriptors :   *BEARINGS, *CORROSION, *WEAR, *CORROSION INHIBITION, ADVERSE CONDITIONS, CHROMATES, ELECTROCHEMISTRY, LUBRICATING OILS, MEASUREMENT, NAVAL AIRCRAFT, ROLL, SODIUM, SODIUM NITRITE, STATISTICAL ANALYSIS, ANTIFRICTION BEARINGS, BEARING ROLLERS, STEEL, SIMULATION, SLIDING CONTACTS, ELECTROLYTES, NUCLEATION, PITTING

Subject Categories : Machinery and Tools

Distribution Statement : APPROVED FOR PUBLIC RELEASE