ASTM D2674-1972(2004)e1 铝表面准备用硫代铬酸盐蚀刻溶液分析的标准试验方法

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【英文标准名称】:StandardMethodsofAnalysisofSulfochromateEtchSolutionUsedinSurfacePreparationofAluminum
【原文标准名称】:铝表面准备用硫代铬酸盐蚀刻溶液分析的标准试验方法
【标准号】:ASTMD2674-1972(2004)e1
【标准状态】:现行
【国别】:
【发布日期】:1972
【实施或试行日期】:
【发布单位】:美国材料与试验协会(US-ASTM)
【起草单位】:D14.80
【标准类型】:(TestMethod)
【标准水平】:()
【中文主题词】:铝;分析;表面预处理;胶粘剂;精整;表面;蚀刻
【英文主题词】:acidetch;aluminum;chromate;sodiumdichromate
【摘要】:1.1Thesemethodsofferameansforcontrollingtheeffectivenessoftheetchantwhichisnormallyusedforpreparingthesurfaceofaluminumalloysforsubsequentadhesivebonding.Astheetchantreactswiththealuminum,hexavalentchromiumisconvertedtotrivalentchromium;ameasureofthetwoandthedifferencecanbeusedtodeterminetheamountofdichromateused.1.2Thesulfochromatesolutioncanbereplenishedbyrestoringthesodiumdichromateandthesulfuricacidtotheoriginalformulationlevels.Thelowerlimitofusefulnesswillvarydependinguponsolutionstorage,adhesivesused,criticalnatureofbondcapability,varietyofmetalsprocessed,etc.andshouldbedetermined.Replenishmentwillbelimitedtothenumberoftimesthechemicalingredientscanberestoredandmaintainedtotherequiredlevelsandshouldbedeterminedbytheuser.Sludgecollectinginthebottomofatankshouldbeminimizedbyperiodicremovalofsludge.Forsomeapplications,thehexavalentchromiumshouldnotfallbelowthetrivalentchromiumcontent.1.3Atypicalaqueoussulfochromateacidetchsolutionformulationisasfollows:Sodiumdichromate(Na2Cr2O7)4.5oz/gal(33.7g/litre)Sulfuricacid(spgr1.84)45oz/gal(337.1g/litre)