Accession Number : ADA138585

Title :   On the Limiting Electrode Potential in Cavities and Its Role in Deciding between SCC (Stress Corrosion Cracking) and HC (Hydrogen Cracking) in Metals.

Descriptive Note : Technical rept.,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MATERIALS SCIENCE AND ENGINEERING

Personal Author(s) : Pickering,H W

PDF Url : ADA138585

Report Date : Feb 1984

Pagination or Media Count : 24

Abstract : This paper reviews the conditions needed to determine whether aqueous-phase crack propagation occurs due to hydrogen (HC) or due to anodic metal dissolution (SCC). It shows that the main question to be answered is whether overlap of the electrode potential regions of the metal dissolution and hydrogen evolution reactions increases or decreases with increasing distance x into a cavity or crack. It also reviews the theoretical and experimental basis of the recently discovered existence of a limiting electrode potential in a cavity, a finding which is paramount to the goal of this paper.

Descriptors :   *Electrochemistry, *Metals, *Electrodes, Cavities, Hydrogen embrittlement, Cracking(Fracturing), Stress corrosion, Anodic polarization, Crack propagation, Reaction kinetics, Mathematical models, Mechanical properties

Subject Categories : Physical Chemistry
      Electrical and Electronic Equipment
      Properties of Metals and Alloys
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE