Accession Number : AD0630974

Title :   CORROSION STUDY XXIV. THE INFLUENCE OF TEMPERATURE ON THE PASSIVATION CHARACTERISTICS OF STAINLESS STEELS,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Prazak,M. ; Spanily,J.

Report Date : 17 MAR 1966

Pagination or Media Count : 15

Abstract : The temperature dependence of the corrosion reaction in the range of the critical passivation current, in the range of passivity, transpassivity, and of secondary passivity were determined for two typical chrome-nickel stainless steels; the dependences were quantitatively expressed by the Arrhenius equation. Certain conceptions of the mechanism of the processes concerned were built up on the basis of the activation-energy values of the respective reactions. From the results it can be seen that the corrosion, in a passive state, rises very steeply with increasing temperature (in the range of 20 - 210 C in a ratio of 1:10,000,000), so that it may become technically significant in the case of higher temperatures. The stability of the passive state and the passivation tendency of the material decrease with equal rapidity with increasing temperature. It has been found that the effectiveness of corrosion inhibition by means of passivating inhibitors decreases as a result of this. (Author)

Descriptors :   (*STAINLESS STEEL, CORROSION), CORROSION, CORROSION INHIBITION, TEMPERATURE, CHROMIUM ALLOYS, NICKEL ALLOYS, HEAT OF ACTIVATION, CZECHOSLOVAKIA

Subject Categories : Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE