INVESTIGATION OF THE CORROSIVE COMPONENT OF MECHANICAL WEAR. Final Progress Report
Measurements were made of corrosive wear on sliding steel surfaces as a function of load, distance of travel, and frequency of rotation past a given area in such a manner that the effects of adnesion and abrasion of the base metal were eliminated. Corrosive wear (frictionul oxidation) is a combination of corrosion and mechanical wear in which freshly-formed oxide layers are sheared off. The following conclusions were reached: The shearing resembles regular adnesive wear, however, here the shearing is presumably all in the brittle oxide layer where cohesive strength is less than for fresh metal. Oxide film forms rapidly on rubbing surfaces with poor lubrication, but slowly with of lubricant due to O/sub 2/ dissolved in the oil. After run-in, the corrosive wear varies linearly with distance of travel. As frequency increases, wear volume decreases. Oxidation depends on the time interval, temperature of asperities, oxygen present, and ambient temperature. for brass rubbing against oxidized iron, frequency has an effect similar to that for steel on steel. Aluminum oxidation cannot be measured by Knoop impressions as the oxide particles erode the base metal. Wear volume increases with temperature from 40 to 72 deg F, is constant from 72 deg F to 160 deg F and increases rapidly to 200 deg F. For steel on steel friction, the contacting surfaces oxidize, the rate being accelerated by localized surface heating. In all probability, the physical forces on the oxide film cause distortion, cracking, and break down whidn accelerates oxidation. (T.R.H.)
- Research Organization:
- Horizons, Inc., Cleveland
- DOE Contract Number:
- AF18(600)-1589
- NSA Number:
- NSA-12-011426
- OSTI ID:
- 4331767
- Report Number(s):
- AFOSR-TR-58-73; AD-158313
- Resource Relation:
- Other Information: Orig. Receipt Date: 31-DEC-58
- Country of Publication:
- United States
- Language:
- English
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