1、BSI M*58 86 I 1b24bb9 O099488 3 W ,e I B rit ish Standards I nst i t u t io n British Standard IS0 8080-1985 M 58: 1986 UDC 629.7 : 621.357.9 : 669.2951 0 British Standards Institution. No part of this publication may be photocopied or otherwise reproduced without the prior permission in writing of
2、BSI British Standard Aerospace Series: Specification for Anodic coating of titanium and titanium alloys by the sulphuric acid process IS0 title: Aerospace-Anodic treatment of titanium and titanium alloys-Sulfuric acid process Srie arospatiale. Traitement anodique du titane et des alliages de titane.
3、 Traitement lacide sulfurique- Spcifications Luft- und Raumfahrt-Reihe. Anodischer Uberzug fr Titan und Titanlegierungen; Schwefelsureverfahren a- National foreword This British Standard, prepared under the direction of the Aerospace Standards Committee is identical with IS0 8080-1 985 Aerospace- An
4、odic treatment of titanium and titanium alloys - Sulfuric acid process, published by the international Organization for Standardization (ISO). The United Kingdom has taken part in the preparation of the international standard through Sub-committee 1 1 of ISO/TC 20. Terminology and conventions. The t
5、ext of the international standard has been approved as suitable for publication as a British Standard without deviation. Some terminology and certain conventions are not identical with those used in British Standards; attention is drawn especially to the following. The comma has been used as a decim
6、al marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. In British Standards it is current practice to use the spelling sulphuric instead of sulfuric. Wherever the words International Standard appear, referring to this standard, they should b
7、e read as British Standard . Compliance with a British Standard does not of itself confer immunity from legal obligations. British Standard M 58: 1986 ES1 M*58 8b W Lb24669 0097489 5 1 Scope and field of application This International Standard specifies the requirements for pro- ducing and testing a
8、n unsealed anodic coating on titanium and titanium alloys. The anodic coating is produced by the sulfuric. acid proceso. The coating is used with solid film lubricants for protection of titanium fasteners against galling, for limited protection of less noble metals against galvanic corrosion when in
9、 contact with titanium or for other approved uses. 2 Technical requirements 2.1 Process details 2.1,l The anodizing solution shall consist of technical grade sulfuric acia in water with a nominal composition in the range from 200 to 400 g/l of H2S04. The solution shall be maintained at a composition
10、 within f10 % of the nominal composition chosen, The chloride content, measured as NaCI, shall not exceed 0,2 g/l. Provided agreement is obtained from the pur- chaser, the chemical composition of the solution may be changed if the coating obtained meets all other requirements of this International S
11、tandard. 2.1.2 The dissolved metal content of the solution, calculated as titanium, shall not exceed 20 g:I. 2.1.3 The solution shall be used at a temperature of 21 L 2 OC. The temperature control equipment shall be capable of maintaining the solution temperature within f 2 OC of the control set poi
12、nt. 2.1.4 The solution shall De contained either in a cor:asion resistant steel tank or a steel tank lined with a suitable acid resistant material. Except in cases where tanks are lead-lined, lined tanks require auxiliary cathode plates made from a material which will not contaminate the solution. 2
13、.1.5 A variable direct current (d.c.1 power source and associated controls and instrumentation for reading applied voltage and current are required. 2.1.6 All fixtures, such as wire, hooks, clamps and racks used to suspend the parts, shall be made from titanium or titanium alloy. 2.1.7 The picklirig
14、 solution shall contain a mixture of nitri and hydrofluoric acids at the following concentrations: 280 to 560 g/l of HNO, 69 % (m/m)l 15 to 25 g/l of HF 70 ?/o (rnlmil 2.2 Preparation for anodizing 2.2.1 Parts shall be thoroughly alkaline cleaned to ensure that all surfaces are free from contaminant
15、s such as grease, oil and mill niarkings. 2.2.2 Chlorinated solvents and methyl alcohol shall not be used for dsgreasing. 2.2.3 Parts shall be firmly attached to the racking devico. Contact areas shall be kept as small as possible and, when practicable, shall be on a surface not required to be coate
16、d. When parts are to be coated on all surfaces, contacts shall be located on areas indicated on the drawing. 2.2.4 Parts shall be oriented so as to minimize gas entrapment during processing. e 2.2.5 After alkaline cleaning, parts shall be etched for 5 to 20 s after the commencement of gassing in the
17、 nitric- hydrofluoric acid pickling solution and then rinsed thoroughly in cold running water. Heavily scaled parts which do not pro- vide a clean, bright surface after the treatment outlined above may require fine alumina grit-blasting or pretreatment in ar, oxidizing alkaline solution prior to etc
18、hing. 2.3 Anodizing procedure 2.3.1 The parts shall then be immersed in the anodizing soh- tion. The parts shall be made the anode and the tank, or aux- iliary plates, the cathode. Current shall be applied, with the voltage being raised to a value within the range from 15 to 20 V for a period of 15
19、min or until the desired coloration has been achieved. The initial current density shall be approximately 0,2 A/dm2, with reductior: to an approximate vallie of 0,05 A!dm2 over the greater part of the anodizing cvcle. 2.3.2 During processing of intricate parts, the solution should be agitated in ord
20、er to minimize entrapment of gas in pockets and blind holes. If necessary, parts should be repositioned periodically to bring the electrolyte into contact with uncoated areas and to prevent attack at the liquid/gas interface in pockets and blind holes. 1 BSI M*58 b W Lb24bb9 0099490 L = - British St
21、andard M/58 : 1986 3.3 After completion of the anodizhg cycle, parts shall be a sed thoroughly in cold, running water, then rinsed in clean, hot water and dried. 2.3.4 If stubsequent surface treatments are to be applied, parts should be handled and stored in such a manner as to avoid thsm being cont
22、aminated. 3 Quality assurance provisions 3.1 Responsibility for inspection Unless otherwise negotiated, the processos is responsible for the performance of all quality assurance requirements of this International Standard. 3.2 Visual examination 3.2.7 The coating shall be smooth and adherent, unifor
23、m in exture and appearance, and shall exhibit a uniform blue-violet lour. It shall be continlious except at contact points. * 3.2.2 Parts showing burned or powdery areas, loose film, discontinuities such as breaks or scratches, a yellow colour or any other damage or imperfection in the anodic film w
24、hich may be detrimental to the function or performance of the parts shall be deemed to be unacceptable. Such paris may be repickled and reprocessed only after consultation with the quality assurance authority responsihle. 3.2.3 Where required in the contract or order, the colour of the parts shall b
25、e substantial!y the same as that of a similarly treated control sample of the same alloy in the same heat treat- ment state and with the same surface finish as the parts being inspected. 3.3 Approval 3.3.1 Sample coated parts and panels shall be approved by the purchaser and, if necessary, by the qu
26、ality assurance authority responsible, before production parts are supp!ied, unless such approval be waived. 3.3.2 Complete documentation of all quality control pro- cedures and tests shall be made available to the purchaser upon request. 3.3.3 The processor shall use manufacturing procedures, pro-
27、cesses and methods of inspection on production parts which are the same as those used on :he approved sample parts. No deviation from the procedures shall be permitted without re- approval by the purchaser. 4 Packaginc; and delivery 4.1 Packaging Anodized parts shall be packaged in such a manner as
28、to en- sure that the parts will be protected during shipment and/or storage against damage due to mishandling, exposure to the weather, or any normal hazard. 4.2 Delivery Anodized parts shall be prepared for shipment and delivery in accordance with good standard practice prevailing in the industry t
29、o ensure carrier acceptame and safe transportation to the point of delivery. Packaging shall conform to carrier rules and regulations applicable :o ?he mode of transportation. For information about BSI services relating to third party certification to suitable British Standard product specifications
30、, schemes for the registration of firms of assessed capability, testing and inspection facilities, please contact the Director, Quality Assurance .Division, BSI, PO Box 375, Milton Keynes MK14 6LO. ,* 2 ElSI M*SB Bb m Lb24669 O099493 3 m Th$ British Standard, having been prepared under the direction
31、 of the Aerospace Standards Committee, was published under the authority of the Board of BSI and comes into effect on 28 February 1986. British Standards Institution, 1986 ISBN O 580 15027 5 British Standards Institution Incorporated by Royal Charter, BSI is the independent national body for the pre
32、paration of British Standards. It is the UK member of the International Organization for Standardization and UK sponsor of the British National Committee of the International Electrotechnical Commission. Copyright Users of British standards are reminded that copyright subsists in all ES1 publication
33、s. No part of this publication may be reproduced in any form without the prior permission in writing of BSI. This does not preclude the free use, in thecourse of implementing the standard, of necessary details such as symbols and size, type or grade designations. Enquiries should be addressed to the
34、 Publications Manager, British Standards Institution, Linford Wood, British Standard M 58: 1986 IS8 8080-1 985 Milton Keynes MK14 6LE. The number for telephone enquiries is 0908 320033 and for telex 825777. Contract requirements A British Standard does not purport to include all the necessary provis
35、ions of a contract. Users of British Standards are responsible for their correct application. Revision of British Standards British Standards are revised, when necessary, by the issue either of amendments or of revised editions. It is important that users of British Standards should ascertain that t
36、hey are in possession of the latest amendments or editions. Information on all BSI publications is in the 8SI Catalogue, supplemented each month by BSI News which is available to subscribing members of the Institution and gives details of new publications, revisions, amendments and withdrawn standar
37、ds. Any person who, when making use of a British Standard, encounters an inaccuracy or ambiguity, is requested to notify BSI without delay in order that the matter may be investigated and appropriate action taken. The following BSI references relate to the work on this standard: Committee reference
38、ACE/-/I Draft for comment 83/79712 DC Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Aerospace Standards Committee (ACE/-) to Subcommittee ACE/-/I, upon which the following bodies were represented: Society of British Aerospace Companies Limited Ministry of Defence c Amendments issued since publication Amd. No. Date of issue Text affected 00 - W e British Standards Institution . 2 Park Street London WIA 2BS . Telephone 01-629 9000 . Telex 266933 ACE/-/1 8602 -3- 1.3k-B
