Accession Number : ADA194337

Title :   Study of the Erosion Corrosion of Alloys and Coatings.

Descriptive Note : Final rept. 7 May 84-20 Sep 87,

Corporate Author : PITTSBURGH UNIV PA DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Birks, N ; Pettit, F S

PDF Url : ADA194337

Report Date : Dec 1987

Pagination or Media Count : 300

Abstract : Apparatus has been developed that allows the erodent size, speed and impact angle on the target to be varied independently. The apparatus also allows temperature and atmosphere composition to be selected. Reliable and reproducible kinetic data have been obtained for the exposure of samples of a range of metals and alloys in the apparatus. When erosion and oxidation processes interact in the degradation of a specimen, an acceleration in the degradation is always observed. The interaction between erosion and oxidation of metals can be divided into several distinct regimes which vary from pure erosion through erosion enhanced oxidation, in which the processes interact but are not modified, to oxidation affected erosion, where the interaction between the processes involves strong modification of the erosion and oxidation processes according to mechanism. The regime of degradation mechanism in which a particular metal specimen finds itself depends upon the relative intensities of the erosive and oxidative processes. Evidence has also been obtained for the coexistence of a further regime, based on scale spallation, at certain values of scale thickness.

Descriptors :   *ALLOYS, ANGLES, CORROSION, DEGRADATION, EROSION, EXPOSURE(GENERAL), INTENSITY, KINETICS, METALS, OXIDATION, RELIABILITY, REPRODUCIBILITY, SAMPLING, SPALLATION, PROTECTIVE COATINGS, CHROMIUM COMPOUNDS, ALUMINUM OXIDES, SULFUR

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE