Accession Number : AD0737587

Title :   Ultrafine Grain Size Effects on Corrosion Behavior.

Descriptive Note : Technical rept.,

Corporate Author : ARMY MATERIALS AND MECHANICS RESEARCH CENTER WATERTOWN MASS

Personal Author(s) : Zabielski,Chester V. ; Levy,Milton

Report Date : SEP 1971

Pagination or Media Count : 30

Abstract : The corrosion behavior of copper alloy (1.0 Cr -0.10 Cb - 0.075 Ti) in grain size range (1.45 to 12.3 micrometers) and 1010 carbon steel (1.0Cb - 0.60 Mn) in grain size range (0.92 to 77.0 micrometers) has been investigated by means of anodic polarization measurements. Based on the anodic polarization measurements, a model is proposed which relates grain size to the critical current density/grain boundary length in one square centimeter. The model indicates that as grain size increases the apparent grain boundary current will increase and suggests finer grain size alloys will be more corrosion resistant and have longer periods of crack incubation. Selected metallographic studies and potential-time measurements were made. (Author)

Descriptors :   (*COPPER ALLOYS, CORROSION), (*STEEL, CORROSION), (*CORROSION, *GRAIN SIZE), CHROMIUM ALLOYS, NIOBIUM ALLOYS, TITANIUM ALLOYS, MANGANESE ALLOYS, CORROSION RESISTANCE, POLARIZATION

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE