ASTM G140-2002 Standard Test Method for Determining Atmospheric Chloride Deposition Rate by Wet Candle Method《用湿蜡法测定大气氯化物沉淀速率的标准试验方法》.pdf
《ASTM G140-2002 Standard Test Method for Determining Atmospheric Chloride Deposition Rate by Wet Candle Method《用湿蜡法测定大气氯化物沉淀速率的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM G140-2002 Standard Test Method for Determining Atmospheric Chloride Deposition Rate by Wet Candle Method《用湿蜡法测定大气氯化物沉淀速率的标准试验方法》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: G 140 02Standard Test Method forDetermining Atmospheric Chloride Deposition Rate by WetCandle Method1This standard is issued under the fixed designation G 140; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year o
2、f last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method describes a wet candle device and itsuse in measuring atmospheric chloride deposition (amount ofch
3、loride salts deposited from the atmosphere on a given areaper unit time).1.2 Data on atmospheric chloride deposition can be usefulin classifying the corrosivity of a specific area, such as anatmospheric test site. Caution must be exercised, however, totake into consideration the season because airbo
4、rne chloridesvary widely between seasons.1.3 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory
5、 limitations prior to use.2. Referenced Documents2.1 ASTM Standards:D 1193 Specification for Reagent Water2D 4458 Test Method for Chloride Ions in Brackish Water,Seawater, and Brines2G 92 Practice for Characterization of Atmospheric TestSites32.2 ISO Standard:ISO 9225 Corrosion of Metals and Alloys.
6、 Aggressivity ofAtmospheresMethods of Measurement of PollutionData43. Significance and Use3.1 This test method is capable of generating quantitativevalues of atmospheric chloride deposition specifying milli-grams of chloride ions per square metre per day (or other unitsderived from such values).NOTE
7、 1Chlorides in the atmosphere exist as a suspension of liquiddroplets or solid particles. They are transported to solid surfaces bygravity, wind, or brownian motions. These transport mechanisms aredirection-sensitive so that a vertical cylinder will not necessarily receivethe same flux as a horizont
8、al plate, or objects with different sizes andorientations. Therefore, the use of this approach to provide an indicationof the deposition of chlorides on objects in atmospheric exposures may notbe quantitatively accurate; however, this technique has been successful inclassifying the severity of expos
9、ure in a variety of marine locations.3.2 The sites where samples are to be taken and thesampling time periods should be established. A continuousprogram of monthly or 30-day exposures is recommended forsite characterization. Seasonal monitoring may be performed ifthere are specific periods of intere
10、st.4. Apparatus4.1 ComponentsThe components needed to construct onewet candle device are as follows:4.1.1 Erlenmeyer Flask, narrow mouth, 500 mL, (glass orpolypropylene). Other size flasks may be used, but dimensionsin Fig. 1 will have to be adjusted accordingly.NOTE 2Polypropylene flasks are recomm
11、ended during threat offreezing weather.4.1.2 Glass Test Tube, general purpose, 16 by 150-mmlength.4.1.3 Solid Rubber or Neoprene Stopper, No. 7, diametertop 38 mm, bottom 30 mm.4.1.4 Cotton Bandage Gauze, strip, 50 mm wide and ap-proximately 1500 mm long.NOTE 3The overall length of the gauze may var
12、y with installation.4.1.5 Type IV Reagent Water, 1 L, 200 mL CHOH(CH2OH2) (glycerin) and 20 drops CH3(CH2)6COOH (oc-tanoic acid) should be added to prevent freezing, if necessary(See Specification D 1193).4.1.6 Gloves, vinyl, one pair.NOTE 4Poly(vinyl chloride) (PVC) is recommended. Latex gloves are
13、not acceptable, as their chloride content is reported to be comparable tothat of human hands.4.2 Support StandA suitable support stand shall beerected at the site where the atmosphere is to be sampled. Atreated wood post (100 by 100 by 2250 mm) or galvanized pipe(42-mm diameter by 2250-mm length) wi
14、th an attached plateon top is suitable, with 750 mm in the ground and 1500 mm1This test method is under the jurisdiction of ASTM Committee G01 onCorrosion of Metals and is the direct responsibility of Subcommittee G01.04 onAtmospheric Corrosion.Current edition approved June 10, 2002. Published July
15、2002. Originallypublished as G 140 96. Last previous edition G 140 96.2Annual Book of ASTM Standards, Vol 11.01.3Annual Book of ASTM Standards, Vol 03.02.4Available from American National Standards Institute, 11 W. 42nd St., 13thFloor, New York, NY 10036.1Copyright ASTM International, 100 Barr Harbo
16、r Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.above the ground on which the apparatus to hold the candle canbe mounted (see Fig. 1). The apparatus shall be mounted sothat the arms supporting the rain cover do not shield the gauzefrom a known source of chloride.4.3 Assembly of
17、 the Wet Candle Apparatus (see Fig. 1):4.3.1 The rubber stopper must be modified.4.3.1.1 In the center, bore a hole 15 mm in diameter throughthe stopper.4.3.1.2 On opposite sides of the conical surface of thestopper, cut or grind a channel or flat, from top to bottom,sufficiently wide (;25 mm) for t
18、he gauze to pass freelybetween the stopper and the neck of the flask when the stopperis installed tightly in the flask (see Fig. 1).4.3.2 Insert the test tube upward through the hole in therubber stopper so that the lip of the tube is at the bottom of thesmall end of the stopper.4.3.2.1 The flask an
19、d tube/stopper assembly should berinsed with Type IV reagent water to remove any contaminants.4.3.3 Cover bare hands with gloves (PVC or other plastic(see Note 4). With freshly opened bandage gauze (50 mmwide), start with a wick 150 mm in length, pass through onechannel in the stopper and tightly wr
20、ap all the exposed area ofthe tube. Using overlapping turns, move up the tube coveringthe top, then back down the tube to the stopper, pass the gauzethrough the other channel in the stopper, leaving anothersection of the gauze approximately equal in length to the first(150 mm).NOTE 5The total area o
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