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Objectives Replicate Alcatel-Lucent’s creep corrosion results

Published byMarlene Lang Modified over 8 years ago

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Presentation on theme: "Objectives Replicate Alcatel-Lucent’s creep corrosion results"— Presentation transcript:

1 IPC 3-11g Mixed Flowing Gas (MFG) Creep Corrosion Benchmarking Test Preliminary Results Feb 2013

2 Objectives Replicate Alcatel-Lucent’s creep corrosion results
Will use exactly the same conditions, test coupons and materials Improved MFG operating procedures

3 Test Vehicle FR4 4” x 5” x 0.063” 9 comb patterns – 7 on top, 2 on bottom 5 comb patterns with perpendicular solder mask strips 4 comb with PTHs – 2 with solder mask defined holes, 2 not Taiyo PSR4000 or equivalent solder mask

4 Surface Finish & Flux Surface finishes ROL0 solder paste
True bare copper SnPb HASL OSP iAg ENIG ROL0 solder paste ORL0 & ROL0 wave fluxes

5 Test Matrix with # of Replicates
Wave flux Surface Finish RO OR None Bare Copper 3 SnPb HASL OSP iAg ENIG

6 Before Testing… Handle by edges with nitrile gloves
Check representative sample with IC as per IPC TM-650, Method Visually inspect & document Vacuum seal with no paper or desiccant Non-contaminating marking Finish, flux, board #

7 Before Testing… Screen solder paste using 6 mil stencil
Reflow once (record parameters) Uniform wave flux application with validated hole penetration (record parameters) Wave solder (record parameters) Coupons stored in clean aluminum foil, if required

8 Actual MFG Testing Clean chamber only if part of usual procedure (record parameters) Copper foil & ASTM B weighed (to nearest 0.01 mg) control samples Coupons & foils parallel to air flow in chamber Recorded, randomized placement 40C, 70-75% RH No bias 20 days

9 Actual MFG Testing - Gas Concentrations
H2S SO2 NO2 Cl2 1700 ppb 200 ppb 20 ppb Like EIA IIIA but with elevated H2S

10 Immediate Post Test Work
Weigh control foils Record amount of creep corrosion on coupons Wrap in Al foil Send off foils & coupons for further analysis

11 Further Post Test Analytical Work
EDX identification of corrosion products from each surface finish/flux combination Remove corrosion products & inspect surfaces of coupons and foils Weigh cleaned foils and calculate corrosion rate ASTM B corrosion rates to be determined coulometrically

12 Appendices to the Test Method
A – Measurement Techniques for Determining the Amount of Wave Solder Flux Applied B – Visual Inspection Criteria for Creep Corrosion Evaluation C – Worksheet for Reporting Board Inspection & Cleanliness Testing Prior to Preconditioning D – Worksheet for Reporting Preconditioning Results & Parameters E – Worksheet for Reporting Parameters from MFG Chambers F – Worksheet for Reporting Measurements & Experimental Results from MFG Tests G – Worksheet for Reporting Results form ASTM B Coupons H Procedure for Removing Corrosion Products

13 Test Sites CALCE Battelle Alcatel-Lucent (5d data only)
Univ. of Limerick (data not plotted yet)

14 Different Types of Corrosion Observed
Discoloration [Bare Copper –day 5] Creep [Immersion Silver–day 5] Flaking [Immersion Silver–day 20] Fiber assisted corrosion [Immersion Silver–day 5 White Patina [Bare Copper –day 10] Green Patina [Bare Copper –day 5]

15 Discoloration CALCE ALU Battelle Board Type Day 5 Day 10 Day 15 Day 20
Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3

16 Creep CALCE ALU Battelle Board Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3

17 Greening CALCE ALU (none) Battelle (none) Board Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3

18 Flaking CALCE ALU (none) Battelle Board Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3

19 White CALCE ALU (none) Battelle Board Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3

20 Summary Data for Each Chamber

21 Results Creep Corrosion Results - CALCE Discoloration Creep Green
Flaking White Board Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3

22 Results Creep Corrosion Results - Battelle Discoloration Creep Green
Flaking White Board Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO

23 Results Discoloration Creep Green Flaking White Board Type Day 5
Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3 ALCATEL LUCENT RESULTS

24 Backup

25 Creep Corrosion Classification PTH Creep
Pre-Creep Build up of corrosion product to edge of solder mask Minor Creep Corrosion onto solder mask Severe Creep Corrosion forms film No Creep

26 Creep Corrosion Classification Creep on traces
Minor Creep . Major Creep No Creep Minor – Corrosion product from trace on solder mask Major – Corrosion product from trace forms a film

27 Creep Corrosion Results - CALCE
PTH: Minor Severe Trace: Pre-Creep Minor Severe Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO The shading Green to blue to red is a progression, so the numbers for each color do not go in order. Example: ImAg day 5 has 3 pre creep, day 10 has 2 pre-creep and 1 minor creep, day 15 has 1 pre creep, 1 minor creep and 1 major creep, day 20 has 2 minor creep and 1 major creep; it took one board 20 days to get minor creep. 3 out of 3 1 out of 3 2 out of 3

28 Trace: PTH: Minor Severe Pre-Creep Minor Severe 3 out of 3 1 out of 3
Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3 ALCATEL LUCENT RESULTS

29 Trace: PTH: Creep Corrosion Results - Battelle Pre-Creep Minor Severe
Type Day 5 Day 10 Day 15 Day 20 Cu Cu-OR Cu-RO SnPb SnPb-OR SnPb-RO OSP OSP-OR OSP-RO ImAg ImAg-OR ImAg-RO ENIG ENIG-OR ENIG-RO 3 out of 3 1 out of 3 2 out of 3

30 Steps for corrosion classification
Identify features of interest and features that will be used to differentiate between different corrosion phenomena Identify levels of corrosion and features that will be used to determine severity Examine samples, taking sample images when different corrosion phenomena occur or corrosion severity increases Combine results for all samples in a single graphic The following charts provide images of corrosion type and/or classification, an overview chart, and supporting documentation. Slides 3-6 cover overall corrosion. Slides 7-18 cover creep corrosion.

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