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ASTM G140-02(2019)
Standard Test Method for Determining Atmospheric Chloride Deposition Rate by Wet Candle Method
Přeložit název
NORMA vydána dne 1.10.2019
Informace o normě:
Označení normy: ASTM G140-02(2019)
Datum vydání normy: 1.10.2019
Kód zboží: NS-973119
Počet stran: 4
Přibližná hmotnost: 12 g (0.03 liber)
Země: Americká technická norma
Kategorie: Technické normy ASTM
Kategorie - podobné normy:
Anotace textu normy ASTM G140-02(2019) :
Keywords:
atmospheric chloride deposition rate, wet candle method,, ICS Number Code 71.040.50 (Physicochemical methods of analysis), 77.060 (Corrosion of metals)
Doplňující informace
| Significance and Use | ||||||||
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3.1 This test method is capable of generating quantitative values of atmospheric chloride deposition specifying milligrams of chloride ions per square metre per day (or other units derived from such values). Note 1: Chlorides in the atmosphere exist as a suspension of
liquid droplets or solid particles. They are transported to solid
surfaces by gravity, wind, or brownian motions. These transport
mechanisms are direction-sensitive so that a vertical cylinder will
not necessarily receive the same flux as a horizontal plate, or
objects with different sizes and orientations. Therefore, the use
of this approach to provide an indication of the deposition of
chlorides on objects in atmospheric exposures may not be
quantitatively accurate; however, this technique has been
successful in classifying the severity of exposure in a variety of
marine locations.
3.2 The sites where samples are to be taken and the sampling time periods should be established. A continuous program of monthly or 30-day exposures is recommended for site characterization. Seasonal monitoring may be performed if there are specific periods of interest. |
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| 1. Scope | ||||||||
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1.1 This test method covers a wet candle device and its use in measuring atmospheric chloride deposition (amount of chloride salts deposited from the atmosphere on a given area per unit time). 1.2 Data on atmospheric chloride deposition can be useful in classifying the corrosivity of a specific area, such as an atmospheric test site. Caution must be exercised, however, to take into consideration the season because airborne chlorides vary widely between seasons. 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use. 1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee. |
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| 2. Referenced Documents | ||||||||
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