1、Designation:G18406(Reapproved 2012)Standard Practice forEvaluating and Qualifying Oil Field and Refinery CorrosionInhibitors Using Rotating Cage1This standard is issued under the fixed designation G184;the number immediately following the designation indicates the year oforiginal adoption or,in the
2、case of revision,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 practice covers a generally accepted procedure touse the rotating cage(RC)for evaluating
3、corrosion inhibitorsfor oil field and refinery applications.1.2 The values stated in SI units are to be regarded asstandard.The values given in parentheses are for informationonly.1.3 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsi
4、bility of the user of this standard to establish appro-priate safety and health practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2G1 Practice for Preparing,Cleaning,and Evaluating Corro-sion Test SpecimensG15 Terminology Relat
5、ing to Corrosion and Corrosion Test-ing(Withdrawn 2010)3G16 Guide for Applying Statistics to Analysis of CorrosionDataG31 Guide for Laboratory Immersion Corrosion Testing ofMetalsG46 Guide for Examination and Evaluation of Pitting Cor-rosionG111 Guide for Corrosion Tests in High Temperature orHigh P
6、ressure Environment,or BothG170 Guide for Evaluating and Qualifying Oilfield andRefinery Corrosion Inhibitors in the LaboratoryD1141 Practice for the Preparation of Substitute OceanWaterD4410 Terminology for Fluvial Sediment3.Terminology3.1 The terminology used throughout shall be in accordancewith
7、Terminologies G15 and D4410 and Guide G170.4.Summary of Practice4.1 This practice provides a method of evaluating corrosioninhibitor efficiency in a RC apparatus.The method uses awell-defined rotating specimen setup and mass loss measure-ments to determine corrosion rates in a laboratory apparatus.M
8、easurements are made at a number of rotation rates toevaluate the inhibitor performance under increasingly severehydrodynamic conditions.5.Significance and Use5.1 Selection of corrosion inhibitor for oil field and refineryapplications involves qualification of corrosion inhibitors in thelaboratory(s
9、ee Guide G170).Field conditions should besimulated in the laboratory in a fast and cost-effective manner(1).45.2 Oil field corrosion inhibitors should provide protectionover a range of flow conditions from stagnant to that foundduring typical production conditions.Not all inhibitors areequally effec
10、tive over this range of conditions so it is importantfor a proper evaluation of inhibitors to test the inhibitors usinga range of flow conditions.5.3 The RC test system is relatively inexpensive and usessimple flat specimens that allow replicates to be run with eachsetup.(2-13).5.4 In this practice,
11、a general procedure is presented toobtain reproducible results using RC to simulate the effects ofdifferent types of coupon materials,inhibitor concentrations,oil,gas and brine compositions,temperature,pressure,andflow.Oil field fluids may often contain sand;however,thispractice does not cover erosi
12、ve effects that occur when sand ispresent.1This practice is under the jurisdiction of ASTM Committee G01 on Corrosionof Metals and is the direct responsibility of Subcommittee G01.05 on LaboratoryCorrosion Tests.Current edition approved Nov.1,2012.Published November 2012.Originallyapproved in 2006.L
13、ast previous edition approved in 2006 as G184 06.DOI:10.1520/G0184-06R12.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM w
14、ebsite.3The last approved version of this historical standard is referenced onwww.astm.org.4The boldface numbers in parentheses refer to the list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 6.A
15、pparatus6.1 Fig.1 shows the schematic diagram of the RC system.An apparatus of suitable size(usually 7500 mL)is used,consisting of inlet and outlet ports,thermowell,temperature-regulating device,a heating device(mantle,hot plate,or bath),and a specimen support system.6.1.1 The vessel(typically 150-m
16、m diameter)is manufac-tured from an inert material.Cast acrylic and polytetrafluoro-ethylene(PTFE)have been used.6.1.2 A PTFE base is fitted at the bottom of the container.At the center of the base,a hole is drilled into which the lowerend of a stirring rod is placed.This arrangement stabilizes thestirrer and the coupons.6.1.3 Typically,eight coupons(each of 75-mm length,19-mm width,and 3-mm thickness,and a surface area of about34.14 cm2)are supported between two PTFE disks(of 80-mmdiameter)moun
