1、Designation:B80810(Reapproved 2015)Standard Test Method forMonitoring of Atmospheric Corrosion Chambers by QuartzCrystal Microbalances1This standard is issued under the fixed designation B808;the number immediately following the designation indicates the year oforiginal adoption or,in the case of re
2、vision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This test method monitors the reactivity of a gaseoustest environment in which metal surfaces(for exampl
3、e,elec-trical contacts,assembled printed wiring boards,and so forth)and other materials subject to pollutant gas attack undergoaccelerated atmospheric corrosion testing.This test method isapplicable to the growth of adherent corrosion films whosetotal corrosion film thickness ranges from a few atomi
4、cmonolayers to approximately a micrometre.1.2 The test method provides a dynamic,continuous,in-situ,procedure for monitoring the corrosion rate in corrosionchambers;the uniformity of corrosion chambers;and thecorrosion rate on different surfaces.Response time in the orderof seconds is possible.1.3 W
5、ith the proper samples,the quartz crystal microbal-ance(QCM)test method can also be used to monitor theweight loss from a surface as a result of the desorption ofsurface species(that is,reduction of an oxide in a reducingatmosphere).(Alternative names for QCM are quartz crystaloscillator,piezoelectr
6、ic crystal oscillator,or thin-film evapora-tion monitor.)1.4 This test method is not sufficient to specify the corrosionprocess that may be occurring in a chamber,since a variety ofpollutant gases and environments may cause similar weightgains.1.5 This test method is generally not applicable to test
7、environments in which solid or liquid particles are deposited onthe surface of the quartz crystal.1.6 The values stated in SI units are to be regarded asstandard.The values in parentheses are for information only.1.7 This standard does not purport to address all of thesafety concerns,if any,associat
8、ed with its use.It is theresponsibility of the user of this standard to become familiarwith all hazards including those identified in the appropriateSafety Data Sheet(SDS)for this product/material as providedby the manufacturer,to establish appropriate safety and healthpractices,and determine the ap
9、plicability of regulatory limi-tations prior to use.2.Referenced Documents2.1 ASTM Standards:2B810 Test Method for Calibration ofAtmospheric CorrosionTest Chambers by Change in Mass of Copper Coupons3.Summary of Test Method3.1 A single crystal of quartz has various natural resonantfrequencies depend
10、ing on the crystals size and shape.Thedecrease in natural frequency is linearly proportional to thecrystal mass and the mass of well-bonded surface films.Forcrystals with reactive metal films on the surface(usuallydriving electrodes),the mass of the crystal/metal film increasesas the metal oxidizes
11、or forms other compounds with gasesadsorbed from the atmosphere.3,4Thus,by measuring the rateof resonant frequency change,a rate of corrosion is measured.Non-adherent corrosion films,particles,and droplets yieldambiguous results.Areview of theory and applications is givenin Lu and Czanderna.5See App
12、endix X1 for discussion of thequantitative relationship between frequency change and masschange.3.2 The chamber environmental uniformity and corrosionrate can be measured by placing matching quartz crystals withmatching reactive metal films at various locations in thechamber.If the chamber and corro
13、sion rate have beenstandardized,the corrosion rate on various surface materialsthat have been deposited on the quartz crystal can be deter-mined.1This test method is under the jurisdiction of ASTM Committee B02 onNonferrous Metals and Alloys and is the direct responsibility of SubcommitteeB02.11 on
14、Electrical Contact Test Methods.Current edition approved Oct.1,2015.Published October 2015.Originallyapproved in 1997.Last previous edition approved in 2010 as B808 10.DOI:10.1520/B0808-10R15.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at servic
15、eastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3King,W.H.Jr.,Analytical Chemistry,Vol 36,1964,p.173.4Karmarkar,K.H.and Guilbaut,G.G.,Analytical Chemistry Acta,Vol 75,1975,p.111.5Lu,C.and Czanderna,A.W.Eds.,Applications of
16、 Piezoelectric Quartz CrystalMicrobalances,Elsevier,c1984.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 4.Significance and Use4.1 Corrosion film growth with thicknesses varying from amonolayer of atoms up to 1 m can readily be measured on acontinuous,real-time,in-situ,basis with QCMs.4.2 The test results obtained for this test method areinfluenced by various factors,including geometrical effects,temperature,humidity,film thickness,f