PREDICTION OF PITTING RATES IN FERROUS METALS FROM SOIL PARAMETERS

FROM A CONSIDERATION OF PIT FORMATION CHEMISTRY, EQUATIONS HAVE BEEN DERIVED THAT CORRESPOND TO EMPIRICAL EQUATIONS DEVELOPED BY THE NBS CORROSION GROUP. THE THEORETICAL EQUATIONS' DERIVATIONS SHOW HOW SOIL RESISTIVITY AND PH AFFECT CORROSION RATES. INTEREST IS FOCUSED ON THE DEPTH OF THE DEEPEST PITS RATHER THAN ON AVERAGE VALUES. THE EMPIRICAL PIT DEPTH-AREA RELATIONSHIP IS COMBINED WITH THEORETICALLY DEVELOPED PIT DEPTH-TIME EQUATION TO FORM A GENERAL EQUATION APPLICABLE TO SOILS OF GOOD, FAIR, OR POOR AERATION HAVING PH VALUES WITHIN THE RANGE 5 TO 9. THE GENERAL EQUATION, WITH APPROPRIATE MODIFICATIONS, IS USEFUL IN SOME CIRCUMSTANCES FOR PREDICTING THE LIFE OF STRUCTURES.

• Supplemental Notes:
  • Vol 61, No 6, PP 305-310, 3 FIG, 3 TAB, 6 REF
• Authors:
  • Rossum, J R
• Publication Date: 1969-6

Media Info

• Serial:
  • Journal Awwa

Subject/Index Terms

• TRT Terms: Aeration; Corrosion; Corrosion protection; Depth; Electrical resistivity; Equations; Forecasting; Iron alloys; pH value; Pits; Pitting; Rates; Service life; Soils
• Uncontrolled Terms: Parameters
• Old TRIS Terms: Ferroalloys; Resistivity
• Subject Areas: Design; Geotechnology; Highways; Materials;

Filing Info

• Accession Number: 00216891
• Record Type: Publication
• Files: TRIS
• Created Date: Dec 22 1994 12:00AM