796 NTERNATIONAL STANDARD (TSO INTERNATIONAL ORGANIZATION FOR STANDARDIZATION -MEKIYHAPOAHA OPTAHY3ALIM IIO CTAHAAPTH3ALIWW.ORGANISATION INTERNATIONALE DE NORMALISATION Aluminium alloys --- Determination of copper -- Electrolytic method First edition--1973-12-01 UDC669.715:546.56:543.25 Ref.No.ISO 796-1973 (E) ISO 796-1973 (E) Descriptors:aluminiumalloys,chemical analysis,determinationof content,copper,electrolytic analysis. Price based on 5 pages No reproduction or networking permited without license from IHS Not for Resale FOREWORD ISO (the International Organization for Standardization) is a worldwide federation of national standards institutes (Iso Member Bodies). The work of developing International Standards is carried out through Iso Technical Committees. Every Member Body interested in a subject for which a Technical Committee has been set up has the right to be represented on that Committee. International organizations, governmental and non-governmental, in liaison with iso, also take part in the work. Draft International Standards adopted by the Technical Committees are circulated to the Member Bodies for approval before their acceptance as International Standards by the ISO Council. Prior to 1972, the results of the work of the Technical Committees were published as Iso Recommendations, these documents are now in the process of being transformed into International Standards. As part of this process, International Technical Committee ISO/TC 79,Lights metals and their alloys. The Member Bodies of the following countries approved the Recommendation : Argentina Germany Poland Austria Hungary South Africa, Rep. of Belgium Korea, Rep. of Spain Brazil India Sweden Bulgaria Ireland Switzerland Canada Israel Turkey Chile Italy United Kingdom Czechoslovakia Japan U.S.S.R. Egypt, Arab Rep.of Netherlands Yugoslavia France Norway TheMember Body of the folowing country expressed disapproval of the Recommendation on technical grounds : U.S.A.* Subsequently, this Member Body approved the Recommendation. @ International Organization for Standardization, 1973 Printed inSwitzerland Copyright International Organizationfor Standardization No reproduction or networking permitted without license from IHS Not for Resale ISO 796-1973 (E) INTERNATIONAL STANDARD Aluminium alloys -- Determination of copper -- Electrolytic method 1 SCOPEANDFIELDOFAPPLICATION 3.7 Nitric acid, p 1,23 g/ml, approximately 7,4 N solution. This International Standard specifies an electrolytic method Take 500 ml of nitric acid (3.6) and make up the volume for the determination of copper in aluminium alloys. to 1 000 ml with water. The method is applicable to the determination of copper content greater than or equal to 0,50 %. 3.8 Perchloric acid, p 1,67 g/ml, approximately 11,7 N solution The method does not apply completely to the following special cases for which it should be modified as described in (Perchloric acid, p 1,54 g/mt (approximately 9 N), can also AnnexAorAnnexB : be used. .1 000 m! of perchloric acid (p 1,67 g/ml), is equivalent to 1 270 ml of perchloric acid (p 1,54 g/ml).) a) alloys containing tin or antimony (see Annex A); b) alloys containing bismuth (see Annex B). 3.9 Perchloric acid, p 1,33 g/ml 1approximately 5,8 N solution. Take 500 ml of perchloric acid (3.8)andmakeupthe 2 PRINCIPLE volume to 1 000 ml with water. Attack with a mixture of perchloric acid and nitric acid. Dehydration of the silica in a perchloric medium and 3.10 Sulphuric acid, p 1,33 g/ml (approximately 11,7 N). filtration of the insoluble residue. Carefully add 35 ml of sulphuric acid (p 1,84 g/ml) to Volatilization of the siliceous residue and recovery of water and, after cooling,make up the volume to 100 ml. copper from the residue. Electrolysis of the solution after addition of nitric acid. 3.11 Tartaric acid, 300 g/l solution. Dissolve 300 g of tartaric acid (CHO6) in a little water and make up the volume to 1 000 ml. 3REAGENTS 3.12 Ammonia, p 0,95 g/ml solution (approximat