Accession Number:

ADA058326

Title:

Fundamental Studies of Dissolution and Passivity of Alloys and Compounds.

Descriptive Note:

Final rept. 1 Mar 77-28 Feb 78,

Corporate Author:

OHIO STATE UNIV RESEARCH FOUNDATION COLUMBUS

Personal Author(s):

Report Date:

1978-07-01

Pagination or Media Count:

120.0

Abstract:

This investigation was concerned with rationalizing the improved stability of passive films obtained by the addition of silicon to iron. Auger Spectroscopy and electrochemical techniques were used. The results indicated the following 1 The beneficial effects of silicon alloying for corrosion resistance is not effective until the alloy contains 14.5 wt 25 at silicon silicon contents of less than 8 wt 15 at are detrimental to the corrosion properties in sulfate and chloride solutions. 2 Silicon enrichment and the formation of an SiO2 film are responsible for the corrosion resistant properties. 3 The formation of an SiO2 film resists the penetration of the sulfate anion. 4 Since no evidence of enhanced pitting resistance was noted in 3 and 8 wt 6.5 and 15 at silicon alloys, it is postulated that the increased pitting resistance noted in stainless steels with 2-3 silicon is due to a synergistic effect of silicon with another alloying element. Author

Subject Categories:

  • Properties of Metals and Alloys
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE