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ASTM Selected Technical Papers
Atmospheric Corrosion of Metals
By
SW Dean, Jr Jr
SW Dean, Jr Jr
1
Air Products and Chemicals, Inc.
,
Allentown, Pa. 18105
;
editor
.
Search for other works by this author on:
EC Rhea
EC Rhea
2
Reynolds Metals Co.
,
Richmond, Va. 23261
;
editor
.
Search for other works by this author on:
ISBN-10:
0-8031-0702-1
ISBN:
978-0-8031-0702-1
No. of Pages:
426
Publisher:
ASTM International
Publication date:
1982

Analytical and statistical analyses of data obtained from a contracted exposure study performed by Rockwell International in St. Louis, Mo. reveal that many microclimate differences can account for observed differences in corrosion behavior within a geographic region. Data from Mansfeld's Atmospheric Corrosion Monitors (ACM's) were evaluated with data from the Regional Air Monitoring System (RAMS). Relative humidity, temperature, wind speed, and levels of total sulfur gases such as sulfur dioxide and oxides of nitrogen were found to be statistically significant variables. Problems of covariance were avoided by partitioning the large data set into subsets.

Relative humidity was found to be the most important but least accurate variable. Because it is seldom measured at exposure sites, an equation was developed to relate site-to-site relative humidity differences to temperature differences. With average relative humidity and another empirical equation, time-of-wetness can be estimated. The results are in good agreement with time-of-wetness from the ACM's.

1.
Hern
,
D. H.
and
Taterka
,
M. H.
,
Regional Air Monitoring System Flow and Procedures Manual
, Report for EPA Contract DU-68-02-2093 by
Rockwell International
, Creve Coeur, Mo.,
08
1977
.
2.
Mansfeld
,
F.
, “
Regional Air Pollution Study—Effects of Airborne Sulfur Pollutants on Materials
,” EPA-600/4-80-007,
Environmental Protection Agency
,
01
1980
.
3.
Mansfeld
,
F.
and
Kenkel
,
J. V.
,
Corrosion
 0010-9312, Vol.
33
, No.
1
,
01
1977
, p. 13.
4.
Bird
,
R. P.
,
Stewart
,
W. E.
, and
Lightfoot
,
E. N.
,
Transport Phenomena
,
Wiley
,
New York
,
1962
, p. 162.
5.
Haynie
,
F. H.
in
Durability of Building Materials and Components
, ASTM STP 691,
American Society for Testing and Materials
,
1980
, p. 157.
6.
Owers
,
M. J.
and
Powell
,
A. W.
,
Atmospheric Environment
 1352-2310, Vol.
8
,
1974
, p. 63.
7.
Lange
,
N. A.
,
Handbook of Chemistry
,
McGraw-Hill
,
New York
,
1956
, p. 1414.
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