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EFFECTS OF ATMOSPHERIC POLLUTANTS ON CORROSION BEHAVIOR OF STEELS

ALTHOUGH BOTH FIELD AND LABORATORY STUDIES HAVE CORRELATED STEEL CORROSION WITH ATMOSPHERIC SULFUR DIOXIDE CONCENTRATION, AND THE REACTION MECHANISM HAS BEEN SUFFICIENTLY STUDIED TO ESTABLISH A DEFINITE CAUSE--EFFECT RELATIONSHIP, UNEXPLAINED SITE-TO-SITE AND SEASON-TO-SEASON VARIATIONS HAVE LED TO THE CONCLUSION THAT UNMEASURED VARIABLES ALSO CONTRIBUTE TO STEEL CORROSION. ONE APPROACH IS TO MEASURE THE CORROSIVENESS AT EACH SITE. ANOTHER, ADOPTED IN THE PRESENT STUDY, IS TO DETERMINE THE IDENTITY OF THESE UNMEASURED VARIABLES AND THE EXTENT OF THEIR EFFECTS. THE EXPERIMENTAL DATA ARE DRAWN FROM THE CONTINUOUS AIR MONITORING PROJECT (CAMP) THAT THE PUBLIC HEALTH SERVICE HAS MAINTAINED IN EIGHT LARGE CITIES AROUND THE COUNTRY SINCE 1961. THE EXPERIMENTAL PROCEDURE AND ANALYTIC EQUATIONS ARE DESCRIBED. IT IS CONCLUDED THAT MORE THAN 90% OF THE VARIABILITY IN CORROSION BEHAVIOR OF THREE TYPES OF STEEL EXPOSED AT URBAN SITES IN THE EIGHT CITIES CAN BE ACCOUNTED FOR BY THE VARIABILITY OF CONCENTRATIONS OF TWO POLLUTANTS: SULFUR DIOXIDE INCREASES CORROSION AND OXIDANTS DECREASE IT. WHILE THE EFFECT OF THE FORMER HAS BEEN OBSERVED MANY TIMES IN THE PAST, THE EFFECT OF THE LATTER IS A NEW OBSERVATION. BECAUSE THE TWO EFFECTS ARE COUNTERACTING, THE RELATIVE RATES BY WHICH THE POLLUTANTS ARE REDUCED IN THE FUTURE WILL STRONGLY AFFECT THE CORROSION BEHAVIOR OF STEELS.

  • Supplemental Notes:
    • Vol 10, No 11, PP 18-21, 2 FIG, 3 TAB, 21 REF
  • Authors:
    • Haynie, F H
    • Upham, J B
  • Publication Date: 1971-11

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Filing Info

  • Accession Number: 00217170
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Dec 30 1971 12:00AM