MILPRF55110G
CONTENTS
PARAGRAPH
PAGE
D.4. SUPERSESSION..........................................................................................................................................64
D.4.1 Superseded specifications.......................................................................................................................64
D.4.1.1 Reference to superseded specifications ...........................................................................................64
D.4.2 Superseded guidelines and standards.....................................................................................................64
D.4.2.1 Estimation of design standard used ..................................................................................................64
D.4.2.2 Retooling...........................................................................................................................................64
D.4.3 Testing.....................................................................................................................................................64
D.4.3.1 Group A testing .................................................................................................................................64
D.4.3.2 Group B samples and testing............................................................................................................65
D.4.4 Superseded test coupons ........................................................................................................................65
D.4.4.1 Test coupons, placement, quantity, and usage .................................................................................65
D.4.5 Intended use and intent of this appendix .................................................................................................65
D.4.5.1 Revisions ..........................................................................................................................................65
D.4.5.2 Test coupons, placement, quantity, and usage .................................................................................65
SEQUENTIAL ELECTROCHEMICAL REDUCTION ANALYSIS (SERA) SOLDERABILITY TEST ..........................67
E.1. SCOPE..........................................................................................................................................................67
E.1.1 Scope ......................................................................................................................................................67
E.2. APPLICABLE DOCUMENTS ........................................................................................................................67
E.2.1 General ....................................................................................................................................................67
E.2.2 Government documents ..........................................................................................................................67
E.2.2.1 Specifications, standards, and handbooks ........................................................................................67
E.2.2.2 Non-Government publications ...........................................................................................................67
E.2.3 Order of precedence................................................................................................................................67
E.3. DEFINITIONS ...............................................................................................................................................68
E.3.1 Sequential Electrochemical Reduction Analysis (SERA) .........................................................................68
E.4. TESTING ......................................................................................................................................................68
E.4.1 Apparatus ................................................................................................................................................68
E.4.1.1 Reservoir...........................................................................................................................................68
E.4.1.2 Test head ..........................................................................................................................................68
E.4.1.3 Vacuum pump ...................................................................................................................................69
E.4.1.4 Gas regulator ....................................................................................................................................69
E.4.1.5 SCE reference electrode ...................................................................................................................69
E.4.1.6 Computer ..........................................................................................................................................69
E.4.1.7 IEEE 488 interface card ....................................................................................................................69
E.4.1.8 Digital multimeter ..............................................................................................................................69
E.4.1.9 Programmable current source...........................................................................................................69
E.4.1.10 Printed wiring board (PWB) contact pin...........................................................................................69
E.4.2 Materials ..................................................................................................................................................69
D.4.2.1 Borate buffer solution ........................................................................................................................69
E.4.2.2 Inert gas ............................................................................................................................................69
E.4.2.3 De-ionized water ...............................................................................................................................70
E.4.2.4 Isopropyl alcohol ...............................................................................................................................70
E.4.2.5 Potassium chloride solution (KCI) .....................................................................................................70
E.5. PROCEDURES .............................................................................................................................................70
E.5.1 General ....................................................................................................................................................70
E.5.2 Preparation of SERA systems .................................................................................................................70
E.5.3 Application of test method .......................................................................................................................71
E.5.3.1 Plated-through hole area calculation .................................................................................................71
E.5.4 Evaluation of test data .............................................................................................................................72
E.5.5 Proper post-test preparation of SERA system .........................................................................................74
E.6. NOTES..........................................................................................................................................................74
E.6.1 Note .........................................................................................................................................................74
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