Significance and Use

Atmospheric corrosion of metallic materials is a function of many weather and atmospheric variables. The effect of specific corrodants, such as sulfur dioxide, can accelerate the atmospheric corrosion of metals significantly. The sulfation plate method provides a simple technique to independently monitor the level of SO ₂ in the atmosphere to yield a weighted average result.

Sulfation plate results may be used to characterize atmospheric corrosion test sites regarding the effective average level of SO ₂ in the atmosphere at these locations.

Sulfation plate testing is useful in determining microclimate, seasonal, and long term variations in the effective average level of SO ₂ .

The results of sulfation plate tests may be used in correlations of atmospheric corrosion rates with atmospheric data to determine the sensitivity of the corrosion rate to SO ₂ level.

The sulfation plate method may also be used with other methods to characterize the atmosphere at sites where buildings or other construction is planned in order to determine the extent of protective measures required for metallic materials.

1. Scope

1.1 This practice covers a weighted average effective SO ₂ level for a 30-day interval through the use of the sulfation plate method, a technique for estimating the effective SO ₂ content of the atmosphere, and especially with regard to the atmospheric corrosion of stationary structures or panels. This practice is aimed at determining SO ₂ levels rather than sulfuric acid aerosol or acid precipitation.

1.2 The results of this practice correlate approximately with volumetric SO ₂ concentrations, although the presence of dew or condensed moisture tends to enhance the capture of SO ₂ into the plate.

1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.

ASTM Standards

D516 Test Method for Sulfate Ion in Water

D1193 Specification for Reagent Water

D2010/D2010M Test Methods for Evaluation of Total Sulfation Activity in the Atmosphere by the Lead Dioxide Technique

G16 Guide for Applying Statistics to Analysis of Corrosion Data

G84 Practice for Measurement of Time-of-Wetness on Surfaces Exposed to Wetting Conditions as in Atmospheric Corrosion Testing

G140 Test Method for Determining Atmospheric Chloride Deposition Rate by Wet Candle Method

ISO Standards

Keywords

atmospheric corrosion; exposures; measurement; plate preparation; sulfate analysis; sulfation plates; sulfur dioxide; Air monitoring; Atmospheric corrosion analysis; Specimen preparation (for testing)--corrosion testing; Sulfation plate technique; Sulfur dioxide (SO 2 ) ;

ICS Code

ICS Number Code 13.040.20 (Ambient atmospheres)

DOI: 10.1520/G0091-11

ASTM International is a member of CrossRef.

ASTM G91