1、 SURFACE VEHICLE RECOMMENDED PRACTICE J2636 MAR2015 Issued 2006-04 Reaffirmed 2015-03 Superseding J2636 APR2006 Corrosion Test Master Establishment RATIONALE J2636 has been reaffirmed to comply woth the SAE five-year review policy. TABLE OF CONTENTS 1. Scope . 1 1.1 Purpose 1 1.2 Rationale 2 2. Refe
2、rences . 2 3. Corrosion Test Methods . 3 4. Procedure . 3 4.1 Figures . 3 4.2 Definitions . 3 4.3 Equiptment and Test Materials 3 4.4 Test Procedures . 7 4.5 Test Procedure for Inter-Laboratory Comparisons 7 4.6 Test Duration 8 1. Scope This SAE lab recommended practice may be applied to corrosion t
3、est methods such as salt spray, filiform, Corrosion creep back, etc. This procedure is intended to permit corrosion testing to be assessed between Laboratories for correlation purposes. 1.1 Purpose The purpose of this procedure is to provide a method to establish and verify a master for corrosion te
4、sting. _ 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 arisin
5、g therefrom, 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 2015 SAE International All rights reserved. No part of
6、 this publication 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-
7、776-4970 (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/J2636_201503 SAE INTERNATIONAL J2636 Reaffirmed MAR2015 Page 2 of 8 1.2 Ra
8、tionale The laboratory corrosion testing of wheels and wheel trim for automotive applications does not have a calibration method that can isolate test equipment, process, personnel, gauging, procedures, and materials from the test results. This document provides a guideline for the establishment of
9、a laboratory master test sample to be utilized to confirm the consistency of the test equipment and process to reproduce consistent results. The masters can also provide a basis to correlate the test results between different laboratories, different test equipment, and different laboratory personnel
10、 by analysis of the quantitative results of the testing. The use of masters also provides a basis for process variation to be evaluated within a calibrated laboratory .The existence of an approved master may also be an important tool in trouble shooting for the continuous improvement process for tes
11、t development. Masters tested in conjunction with test sample pieces may provide a rationale for invalidating test results if the results are inconsistent with an established performance level for the master. 2. REFERENCES 2.1 Applicable Publications The following publications form a part of this sp
12、ecification to the extent specified herein. Unless otherwise indicated, the latest version of SAE publications shall apply. 2.1.1 ISO PUBLICATIONS Available from International Organization for Standardization, 1 rue de Varembe, Case postale 56, CH-1211 Geneva 20, Switzerland, Tel: +41-22-749-01-11,
13、www.iso.org. ISO Guide 43-1Proficiency testing inter-laboratory comparisonsPart 1 ISO Guide 43-2Proficiency testing inter-laboratory comparisonsPart 2 ISO/IEC 17025General Requirements for the Competence of Testing and Calibration of Laboratories 2.2 Related Publications The following publications a
14、re provided for information purposes and are not a required part of this document. 2.2.1 ASTM PUBLICATIONS Available from American Society for Testing and Materials, 100 Barr Harbor Drive, West Conshohocken, PA 19428-2959, Tel: 610-832-9585, www.astm.org. 2.2.2 AIAG PUBLICATIONS Available from Autom
15、otive Industry Action Group, 26200 Lahser Road, Suite 200, Southfield, MI 48034-7100, Tel: 248-358-3570, www.aiag.org. SAE INTERNATIONAL J2636 Reaffirmed MAR2015 Page 3 of 8 3. Corrosion Test Methods This method can be used in conjunction with many existing test procedures for corrosion testing as i
16、t provides an approach that allows the method be tailored to the specific procedure. 4. Procedure The establishment of a test master sample will vary depending upon the component design, expected or intended corrosion performance objective, and the capability of the test measurement systems. A speci
17、fic procedure for each laboratory test method is required and a general procedure is not practical to cover the specific issues unique to the individual products and processes. The correlation procedure is provided as follows: This procedure is intended to provide a framework for a laboratory to est
18、ablish a master lot and qualify the master lot for use in establishing laboratory to laboratory correlation. 4.1 Figures 4.1.1 Figure 1Mastering Decision Tree, Master Qualification. Figure 1 provides a systematic approach to qualifying a test master, master lot. 4.1.2 Figure 2Mastering Decision Tree
19、, Test Operations. Figure 2 provides a systematic approach to evaluating the test operations for correlation with another laboratory and to re-qualify a master lot. 4.1.3 Figure 3Mastering Decision Tree, Test Procedure Qualification. Figure 3 provides a systematic approach to evaluate the test proce
20、dure and assess factors that influence the Gage R & R of the test. 4.1.4 Figure 4Measurement Systems Assessment Flow Diagram. Figure 4 provides a general outline of the factors that contribute to the capability of the test to assess part performance. 4.2 Definitions 4.2.1 MASTER SAMPLE A sample part
21、 which is produced from a master lot with minimum variation in corrosion performance between any and all of the parts. 4.2.2 MASTER LOT A master lot is a production lot for which process and material variations are minimized such that, as much as possible, each part is equivalent to the one before a
22、nd after it in the process for corrosion performance. 4.3 Equipment and Test Materials Equipment and test materials will vary dependant on the specific test for which this method is applied. SAE INTERNATIONAL J2636 Reaffirmed MAR2015 Page 4 of 8 FIGURE 1MASTERING DECISION TREE, MASTER QUALIFICATION
23、SAE INTERNATIONAL J2636 Reaffirmed MAR2015 Page 5 of 8 FIGURE 2MASTERING DECISION TREE, TEST OPERATIONS SAE INTERNATIONAL J2636 Reaffirmed MAR2015 Page 6 of 8 FIGURE 3MASTERING DECISION TREE, TEST PROCEDURE QUALIFICATION SAE INTERNATIONAL J2636 Reaffirmed MAR2015 Page 7 of 8 FIGURE 4MEASUREMENT SYST
24、EMS ASSESSMENT FLOW DIAGRAM 4.4 Test Procedures The test procedures will vary dependant on the specific test for which this method is applied. The intent is that the procedure should address the items listed in the outlined documents and a record that these items have been assessed is documented. Sh
25、ould the procedure not be capable of achieving acceptable correlation with a laboratory then these documents provide a framework for establishing an improvement plan. 4.5 Test Procedure for Inter-Laboratory Comparisons The procedure to compare the test results of a test master between two or more la
26、boratories as being equivalent is as follows: 4.5.1 The procedure to establish laboratory to laboratory correlation is defined in the document ISO/IEC 17025. The referenced requirements include the ISO Guide 43-1, “Proficiency Testing Inter-Laboratory Comparisons Part 1,“ and ISO Guide 43-2, “Profic
27、iency Testing Inter-Laboratory Comparisons Part 2“. These documents define two alternate methods can be used for these comparisons. This document requires that a minimum of 10 master data points be included in any inter-Laboratory comparison and that no more then five of these data points be from th
28、e same test run for this assessment. 4.5.2 Should the inter-laboratory assessment meet the standard for equivalency then this procedure further allows the data to be have an adjustment factor applied to allow the data to be reported as equalized. This data must be specified as adjusted in any report
29、 and the adjustment factor specified. The method for determining the appropriate adjustment factor is as follows: (Eq. 1) SAE INTERNATIONAL J2636 Reaffirmed MAR2015 Page 8 of 8 4.5.3 This adjustment factor will apply as long as the inter-laboratory results are acceptable and the same test master is
30、in use. Should a new test master be employed then the inter-laboratory comparison must be performed again. Laboratories utilizing these methods must employ a method to ensure the ongoing test results maintain the inter-laboratory correlation. The preferred method to ensure this is to test a sample w
31、ith a master. If the master data is consistent with the Inter-laboratory results based on a comparison to upper and lower control limits the data may be accepted. If these test results of the master do not demonstrate consistency as evidenced by being within the control limits the laboratory results
32、 may be invalidated depending on the analysis performed, reference Figure 3Mastering Decision Tree, Test Procedure Qualification, and Figure 4Measurement Systems Assessment Flow Diagram. The upper and lower control limits are calculated as per the AIAG published method and the limits as set per 2 si
33、gma capability. 4.6 Test Duration Test duration will vary dependant on the specific test for which this method is applied, such as “A“ to “B“ comparisons, “testing to failure”, and or test to specified cycle or time duration limits, etc. PREPARED BY THE SAE WHEEL FINISH CORROSION TEST SUBCOMMITTEE OF THE SAE WHEEL STANDARDS COMMITTEE REAFFIRMED BY THE SAE WHEEL STANDARDS COMMITTEE
