1、_ SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising there
2、from, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be revised, reaffirmed, stabilized, or cancelled. SAE invites your written comments and suggestions. Copyright 2013 SAE International All rights reserved. No part of this p
3、ublication may be reproduced, stored in a retrieval system or transmitted, in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without the prior written permission of SAE. TO PLACE A DOCUMENT ORDER: Tel: 877-606-7323 (inside USA and Canada) Tel: +1 724-776-497
4、0 (outside USA) Fax: 724-776-0790 Email: CustomerServicesae.org SAE WEB ADDRESS: http:/www.sae.org SAE values your input. To provide feedback on this Technical Report, please visit http:/www.sae.org/technical/standards/AS4792A AEROSPACE STANDARD AS4792 REV. A Issued 1993-01 Revised 2013-03 Supersedi
5、ng AS4792 Water Conditioning Agents for Aqueous Magnetic Particle Inspection RATIONALE AS4792A revises Fluorescence (4.3) to update cancelled or withdrawn standards, and is a Five Year Review and update of this standard. 1. SCOPE 1.1 This SAE Aerospace Standard (AS) covers water conditioning agents
6、used to facilitate aqueous wet-method magnetic particle inspection. 1.2 Such conditioning agents, in powder or liquid form, provide suitable corrosion protection, wetting, and particle dispensability properties when mixed in water for application of magnetic particles on the surface of an object for
7、 magnetic particle inspection as described in AMS3042, AMS3044, ASTM E1444, and others. 1.3 Water conditioning agents can consist of varying combinations of such components as dispersants, surfactants, corrosion inhibitors, and anti-foaming agents. Individual components may be added to the bath of a
8、 system to develop specific properties. The user is referred to the manufacturer of the conditioning agent to develop the most suitable combination of ingredients for the users requirements. 1.4 Safety - Hazardous Materials While the materials, methods, applications, and processes described or refer
9、enced in this aerospace standard may involve the use of hazardous materials, this aerospace standard practice does not address the hazards which may be involved in such use. It is the sole responsibility of the user to ensure familiarity with the safe and proper use of any hazardous materials and to
10、 take necessary precautionary measures to ensure the health and safety of all personnel involved. 2. APPLICABLE DOCUMENTS The following publications form a part of this document to the extent specified herein. The latest issue of SAE publications shall apply. The applicable issue of other publicatio
11、ns shall be the issue in effect on the date of the purchase order. In the event of conflict between the text of this document and references cited herein, the text of this document takes precedence. Nothing in this document, however, supersedes applicable laws and regulations unless a specific exemp
12、tion has been obtained. SAE AS4792A Page 2 of 4 2.1 SAE Publications Available from SAE International, 400 Commonwealth Drive, Warrendale, PA 15096-0001, Tel: 877-606-7323 (inside USA and Canada) or 724-776-4970 (outside USA), www.sae.org. AMS3042 Magnetic Particles, Nonfluorescent Wet Method, Dry P
13、owder AMS3044 Magnetic Particles, Fluorescent, Wet Method, Dry Powder 2.2 ASTM Publications Available from ASTM International, 100 Barr Harbor Drive, P.O. Box C700, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. ASTM D445 Kinematic Viscosity of Transparent and Opaque Liquids (and
14、 Calculation of Dynamic Viscosity) ASTM E1444 Magnetic Particle Testing 3. PREPARATION 3.1 Bath Preparation The conditioning agent shall be first added to the water bath, followed by the dispersion of the magnetic particles in accordance with manufacturers instructions. 3.2 Premixed Particles When u
15、sing a product containing a premixture of water conditioner and magnetic particles, the premixed product shall be mixed with tap water in accordance with manufacturers instructions. 3.3 Equipment Equipment used for evaluation of an aqueous magnetic particle suspension shall be clean and free from co
16、ntaminants including dirt, oil, and other foreign substances. 3.4 Storage Conditioning agents shall be stored at room temperature in a sealed container away from heat, cold, and moisture. An acceptable shelf life shall be as recommended by manufacturer. Expiration date of the product, when applicabl
17、e, shall be plainly marked on the package label by the manufacturer. Improperly stored or otherwise spoiled agents shall be disposed of in accordance with appropriate regulations. 3.5 Property Requirements 3.5.1 Material The conditioning agent shall be a water soluble or water dispersible compound c
18、onforming to the following requirements when tested in properly diluted form. 3.5.1.1 Fluorescence The fluorescence of the conditioning water shall be not greater than that of a 10 ppm (1.27 x 10-5molar) solution of quinine sulfate dehydrate in 0.1 N sulfuric acid (H2SO4), determined by visual compa
19、rison of the two solutions in 10 x 75 mm glass tubes. Minimum blacklight intensity shall be 1200 microwatts per cm2at the surface. SAE AS4792A Page 3 of 4 3.5.1.1.1 Determinations shall be made by visual comparison of the two tubes under blacklight of 365 nm wavelength. 3.5.1.2 Particulate Matter Th
20、e conditioning agent shall be readily and fully soluble in water. A solution of conditioning agent and water shall not display any particulate matter. 3.5.1.3 Basicity Solution shall exhibit a pH of 7.0 to 10.0. 3.5.1.4 Odor Shall not be offensive, objectionable, or disagreeable. 3.5.1.5 Toxicity A
21、solution shall have no adverse effect on the health of personnel when used for its intended purpose. The fluid shall not contain any components which produce vapors in such concentrations as to be an annoyance to personnel during use. 3.5.1.6 Surface Wetting/Adherence An unbroken film shall be obser
22、ved over the entire part when tested in accordance with 4.1. 4. QUALITY ASSURANCE PROVISIONS 4.1 Water Break Test A clean part with a surface finish the same as parts to be tested shall be flooded with the conditioned water. Note the appearance of the surface during flooding. Sufficient wetting agen
23、t is deemed to be present if a continuous film forms over the entire part. If the part shows a break in the suspension film during flooding exposing bare surface, insufficient water conditioner may be present or the part may not be adequately cleaned. Additional agents, such as anti-foaming agents,
24、may be added to the bath so long as bath performance is not affected. 4.2 Preliminary Processing Evaluations An aqueous magnetic particle bath suspension shall be prepared by dispersing the recommended levels of magnetic particles and conditioning agent in water (preferably at room temperature). 4.2
25、.1 Preparation Identify the part of component to be inspected and ensure that it is free of oil, dirt, or any other foreign substance. Immerse, spray, or otherwise expose the object to the aqueous bath solution. Excess solution should be allowed to drain and the part shall then be placed in an envir
26、onment representative of its usual processing and left undisturbed for sufficient time to allow complete drying of the surface. 4.2.1.1 Inspect the surface for any indication of corrosion. If an indication is observed that is deemed objectionable, the test may be repeated with an increased concentra
27、tion of corrosion inhibitor in the solution. The tests may be continually repeated until a suitable concentration level is established, and that level shall be considered the standard concentration of corrosion inhibitor for that object or part of material. 4.2.1.1.1 Corrosion of Equipment and Mater
28、ials Inspection equipment and particles may be subject to corrosion when used with a water-bath system. Consideration of this probable effect should be taken when developing the requirements of the conditioning agent. SAE AS4792A Page 4 of 4 4.3 Fluorescence Place a 100-ml sample of the completely p
29、repared magnetic particle aqueous bath in a pear-shaped centrifuge tube in accordance with ASTM D445. Allow the tube to stand undisturbed for not less than 60 minutes and examine the liquid above the precipitate under blacklight. Fluorescence observed in the liquid should be visually compared to the
30、 fluid prepared as in 3.1 or 3.2. 4.3.1 Acceptance criteria shall be in accordance with ASTM D445 and parameters of ASTM E1444. 4.3.2 Particles shall settle evenly in the ASTM D445 tube and shall not exhibit an uneven appearance. 4.4 Deterioration Water additives shall not cause any deterioration to
31、 the particles or their coatings when tested in accordance with AMS3042 or AMS3044. 5. RESPONSIBILITY FOR INSPECTION Quality assurance departments or individual inspection parties are responsible for protection from corrosion during storage or transit of parts/components after inspection. 6. REJECTI
32、ONS Water conditioning agents, when tested in accordance with provisions of this aerospace standard, that do not conform, will be subject to rejection or retesting as noted. 7. NOTES 7.1 A change bar (l) located in the left margin is for the convenience of the user in locating areas where technical
33、revisions, not editorial changes, have been made to the previous issue of this document. An (R) symbol to the left of the document title indicates a complete revision of the document, including technical revisions. Change bars and (R) are not used in original publications, nor in documents that contain editorial changes only. 7.2 Compatibility The manufacturer of an agent shall be responsible for compatibility of its own conditioning agents and particles. PREPARED BY AMS COMMITTEE “K”
