8079 (ISO International Standard INTE RNATIONAL ORGANIZATION FOR STANDARDIZATiON MEXAYHAPOAHA OPAHW3AuMA nO CTAHAAPTW3AuMWORGANISATION INTERNATIONALE DE NORMALISATION agent for ISO standards in the United States ANSI was granted an exclusive license to within the Us A Under this license agreement iSO has granted to ANSI the right to reproduce ISO standards and drafts within the territories of the United States" Aerospace process - Anodic treatment of aluminium alloys -- Sulfuric acid process, dyed coating Procedes de traitement dans I'industrie aérospatiale - Traitement anodique des alliages d'aluminium - Traitement a I'acide sulfurique pour revetement colore First edition --- 1984-10-15 UDC 669.716.9 : 629.7 Ref. No. 1SO 8079-1984 (E) ISO 8079-1984 (E) Descriptors : aircraft industry, aluminium alloys, anodizing, anodic coating, specifications, quality assurance, tests, packing, suifuric acid Price based on 3 pages Copyright International Organization for Standardization ted without license from IHS Not for Resale Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Every member the right to be represented on that committee. International organizations, govern- 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. They are approved in accordance with IsO procedures requiring at International Standard ISO 8079 was prepared by Technical Committee ISO/TC 20, Aircraft and space vehicles. International Organization for Standardization, 1984 Printed in Switzerland n or networking permitted without license from IHS Not for Resale ISO 8079-1984 (E) INTERNATIONAL STANDARD Aerospace process - Anodic treatment of aluminium alloys - Sulfuric acid process, dyed coating Scope and field of application 3.3 Process details This International Standard specifies requirements for pro. ducing and testing a dyed anodic coating on atuminium alloys 3.3.1 Electrolyte where the coating is not required to withstand prolonged ex- posure to weathering and direct sunlight. The anodic coating is The electrolyte shall be an aqueous solution of sulfuric acid, produced by the sulfuric acid process. technical grade (g 1,83) at a nominal concentration of 15 % (m/m) (allowable range: 150 to 200 g H2SO4 per litre). The anodizing process is applied in the manufacture of The maximum dissolved aluminium content in the electrolyte aerospace products to improve resistance to corrosion, pro- shall not exceed 15 g/l. The chloride content, measured as duce coloured surfaces for aesthetic reasons or to coiour code NaCl, shall not exceed 0,2 g NaCl per litre. The temperature of parts for identification purposes. the bath shall be maintained at 21 ± 2 oC. 2 References 3.3.2 Dye iso2064,Metallic and other non-organic coatings Defi nitions and conventions concerning the measurement of The colouring agent shall be such as to produce the required thickness. colour on all coatings produced to the requirements of this International Standard. After application, it shall maintain its Iso2106,Anodizing of aluminiumand itsalloys -Determina- cotour without fading under all reasonable expected conditions tion of mass per unit area (surface density) of anodic oxide of storage and service. Fading due to exposure to ionizing coatings - Gravimetric method. radiation shall not be considered as a reasonably expected con- dition of service. Iso 2360, Non-conductive coatings on non-magnetic basis metals -- Measurement of coating thickness -- Eddy current method. 3 Water quality 3.3.3 Iso 2859, Sampling procedures and tables for inspection by The quality of the water used shall be such that its initial con- attributes. ductivity does not exceed 1,000 μS/m. Total dissolved