Accession Number : ADA304225

Title :   Prediction of Hydrogen Entry and Permeation in Metals and Alloys.

Descriptive Note : Annual rept. 1 Oct 94-30 Sep 95,

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

Personal Author(s) : Pickering, Howard W.

PDF Url : ADA304225

Report Date : JAN 1996

Pagination or Media Count : 60

Abstract : The ongoing objectives of this research project are to understand the mechanism of hydrogen entry into metals and to search for and evaluate various remedial measures to control this process and the subsequent hydrogen embrittlement. Several parallel approaches are pursued to achieve these objectives. During the last year, significant progress has been achieved on several tasks. A brief description is given below on each of these following tasks: (1) Effect of chloride ions on the evolution and absorption of hydrogen in iron. (2) Effect of benzotriazole (BTA) on the permeability of electrolytic hydrogen through iron. (3) Underpotential deposition and absorption of hydrogen (UPD). (4) Distributions of cathodic and anodic reaction sites during environmentally assisted cracking. (5) Hydrogen evolution and absorption within grain boundary grooves in sensitized stainless steels under anodic protection. (6) Shape evolution of pits and crevices and its role in hydrogen absorption. jg p5

Descriptors :   *METALS, *PERMEABILITY, *PREDICTIONS, *ALLOYS, *HYDROGEN, IONS, ENVIRONMENTS, CRACKS, SITES, STAINLESS STEEL, IRON, CATHODES, RESPONSE, CHLORIDES, EVOLUTION(GENERAL), PROTECTION, ABSORPTION, PARALLEL ORIENTATION, HYDROGEN EMBRITTLEMENT, ANODIC COATINGS, GRAIN BOUNDARIES, ELECTROLYSIS, SENSITIZING.

Subject Categories : Inorganic Chemistry
      Physical Chemistry
      Properties of Metals and Alloys

Distribution Statement : APPROVED FOR PUBLIC RELEASE