1、Designation:C71590(Reapproved 2016)Standard Test Method forNickel on Steel for Porcelain Enameling by PhotometricAnalysis1This standard is issued under the fixed designation C715;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the ye
2、ar 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.INTRODUCTIONThe test is designed to give a sufficiently accurate and rapid test of the amount of nickel depositedon sheet steel
3、for enameling plant control work via a photometric method.However,the approxima-tions used in the method prevent its use where extremely accurate nickel determinations are required.The method is applicable to control the weight of nickel coating on the metal.1.Scope1.1 This test method covers the de
4、termination of the amountof nickel deposited on sheet steel during its preparation forporcelain enameling.It is a photometric method commonlyused on production parts and is suitable for determining theheavier nickel deposits that may be obtained during theprocessing of steel for one-coat enameling.N
5、OTE1An alternative X-ray emission spectrometry method is TestMethod C810.1.2 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
6、 applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2C810 Test Method for Nickel on Steel for Porcelain Enam-eling by X-Ray Emission SpectrometryE30 Test Methods for ChemicalAnalysis of Steel,Cast Iron,Open-Hearth Iron,and Wrought Iron(Withdrawn 1995)3E60
7、Practice for Analysis of Metals,Ores,and RelatedMaterials by Spectrophotometry3.Significance and Use3.1 This test method is primarily used to control the nickeldipping operation to ensure that the desired level of nickeldeposition is attained.It is also used to prepare test plates usedfor calibratio
8、n in Test Method C810.4.Apparatus4.1 Photoelectric Photometer,conforming to Practice E60.4.2 Weighted Rubber Ring Assembly,required to confinestripping agents to a definite area,consisting of a moldedrubber ring and a metal outer ring.The rubber ring shall havean inside diameter of 1.35 in.(34.3 mm)
9、in order to encircle anarea of 0.01 ft2(0.000929 m2),a wall configuration as shownin Fig.1,and the lower portion beveled at a 45 angle(0.78rad)to reduce the contact area and ensure a better seal.Themetal outer ring shall weigh about 3.5 lb(1.5 kg),suitablymachined to fit over the top of the rubber r
10、ing as shown in Fig.1.4.2.1 The exact area covered by the rubber ring willgradually increase as the rubber ring itself is consumed by theacid reagent used.In the most accurate analysis,the area etchedby the rubber ring shall be calculated occasionally,factoredagainst the prescribed area,and that num
11、ber applied to thereading obtained from the graph.4.3 Aspirator,consisting of a calibrated 500-mL flask,equipped with a twohole stopper,an aspirator bulb,and asuction tube formed from 0.079-in.(2-mm)inside diametercapillary glass tubing.5.Reagents and Materials5.1 Reagent grade chemicals shall be us
12、ed in all tests.Unless otherwise indicated,it is intended that all reagents shallconform to the specifications of the Committee of Analytical1This test method is under the jurisdiction ofASTM Committee B08 on Metallicand Inorganic Coatings and is the direct responsibility of Subcommittee B08.12 onMa
13、terials for Porcelain Enamel and Ceramic-Metal Systems.Current edition approved Nov.1,2016.Published November 2016.Originallyapproved in 1977.Last previous edition approved in 2011 as C715 90(2011)1.DOI:10.1520/C0715-90R16.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact
14、ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.3The last approved version of this historical standard is referenced onwww.astm.org.Copyright ASTM International,100 Barr Harbor Drive,PO Box C
15、700,West Conshohocken,PA 19428-2959.United States1 Reagents of the American Chemical Society.4Other gradesmay be used,provided it is first ascertained that the reagent isof sufficiently high purity to permit its use without lesseningthe accuracy of the determination.5.2 Purity of WaterUse distilled
16、or deionized water.5.3 Ammonium Hydroxide(sp gr 0.90)Concentrated am-monium hydroxide(NH4OH).5.4 Ammonium Persulfate(NH4)2S2O8.5.5 DimethylglyoximePrepare a 1%solution of dimethyl-glyoxime in methyl alcohol or a 2.62%solution of sodiumdimethylglyoximate in water(store in a polyethylene bottle).5.6 Hydrochloric Acid(1+5)Dilute 1 vol of concentratedhydrochloric acid(HCl,sp gr 1.19)with 5 vol of water.5.7 Nickel Sulfate,Standard SolutionDissolve 0.448 g ofnickel sulfate(NiSO46H2O)in water.When the
