Weathering steel weight-loss data

Weathering Steel Corrosion. Triplicate specimens were exposed for periods varying from three to thirty months with exposures started at each of the four seasons during the first year. The experimental procedure and exposure schedule are documented in an EPA report (2f The results are 153 sets of triplicate weight loss data with site, exposure time and initial exposure season as primary variables. 

Weight-loss data for the galvanized and weathering steel for the covered and uncovered conditions are shown in Table 1 for each exposure period. The differences in weight-loss (Aloss) for covered and uncovered conditions are also shown in the table. 

Weathering steel samples were exposed for periods of up to 30 months at nine air monitoring sites in the St. Louis, Missouri area. Climatic and air quality data were recorded during the exposure period and subjected to a rigorous evaluation to eliminate recording errors and to estimate missing values. Weight loss was used as the measure of steel corrosion. 

After the initial six-month exposure period, the identity code of the weathering steel panels was not readable and new panels were prepared and exposed. The weight-loss of the unidentified panels was determined as the difference of the combined weight of the triplicate panels for each exposure period. This data is reported in Table 1 without computation of a standard deviation. 

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