The Future for Fastening Dissimilar Metals
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Nylok developed NYSHIELDTM, a coating for preventing galvanic corrosion between dissimilar metals like steel, stainless steel, aluminum, magnesium, and carbon fiber. Accelerated corrosion testing showed NYSHIELDTM protected steel fasteners joined to magnesium and carbon fiber for over 15 years of simulated exposure, while uncoated fasteners failed within a few years. NYSHIELDTM maintained uniform thickness, had suitable coefficient of friction and tension holding properties, and demonstrated strong adhesion and resistance to automotive fluids and cleaners.
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The Future for Fastening Dissimilar Metals
- 1. NYSHIELD TM 1 COATI NG FOR GALVAN IC CORROSION PREVENTION EXPANDING OPTIONS FOR FASTENING DISSIMILAR METALS CONFIDENTIAL
- 2. NYSHIELD TM TOUGHEST MATERIALS TO JOIN • NYLOK’S NYSHIELD™ COATING PREVENTS GALVANIC CORROSION • NYSHIELD™ PROTECTS STEEL FASTENERS FROM GALVANIC CORROSION IN HIGH RISK MATERIAL COMBINATIONS: - CARBON FIBER - STAINLESS STEEL - ALUMINUM - MAGNESIUM • CARBON FIBER AND MAGNESIUM ARE AT THE EXTREME ENDS OF THE ANODIC INDEX • THIS MEANS THAT THEY WILL SEVERELY REACT WITH STEEL AND CORROSION WILL BE ACCELERATED 2 CONFIDENTIAL Nylok Used the Toughest Materials For Galvanic Corrosion Prevention For All Tests (Mg and C-Fiber)
- 3. NYSHIELD TM NYLOK CORROSION CHAMBER 3 Replicates GM Proving Grounds Chambers – Meets GMW17026 Requirements CONFIDENTIAL
- 4. NYSHIELD TM ACCELERATED CORROSION TEST 4 Test method used: GMW17026 – Accelerated Corrosion Laboratory Test for Galvanic Corrosion Mechanisms Uncoated steel coupon are used as a control to monitor the average general bare steel corrosion produced by the test environment per GMW17026 Control – pre test Control – post test CONFIDENTIAL
- 5. NYSHIELD TM ACCELERATED CORROSION TEST 5 Coupon mass loss chart – correlation to number of years exposure in field CONFIDENTIAL y = 8.2546x + 3.6325 0 25 50 75 100 125 150 175 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 Cycles(1%oftest),1/2daypercycle Mass Loss (grams) GMW 17026 Qualification Test - Coupon Mass Loss Performed in Nylok Corrosion Chamber
- 6. NYSHIELD TM 6 CORROSION CHAMBER TEST RESULTS CONTROL VS. NYSHIELDTM ON MAGNESIUM PER GMW17026 CONFIDENTIAL The upcoming slides demonstrate how corrosion occurs in the control joint and in the joint using NYSHIELDTM coated fasteners
- 7. NYSHIELD TM NYSHIELD™GMW3044FINISH CONTROLGMW3359FINISH MASS LOSS = 7% END OF TEST STEEL FASTENERS ON MAGNESIUM, 5 DAY EXPOSURE 7 CONFIDENTIAL Control bolt causes Mg plate to fail after only 5 days exposure (1 year field simulation) in the GMW17026 test.
- 8. NYSHIELD TM MASS LOSS = 17% END OF TEST STEEL FASTENERS ON MAGNESIUM, 10 DAY EXPOSURE 8 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 2 years field exposure.
- 9. NYSHIELD TM MASS LOSS =28% END OF TEST STEEL FASTENERS ON MAGNESIUM, 15 DAY EXPOSURE 9 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 3 years field exposure.
- 10. NYSHIELD TM MASS LOSS = 38% END OF TEST STEEL FASTENERS ON MAGNESIUM, 20 DAY EXPOSURE 10 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 4 years field exposure.
- 11. NYSHIELD TM MASS LOSS = 51% END OF TEST STEEL FASTENERS ON MAGNESIUM, 26 DAY EXPOSURE 11 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 5 years field exposure.
- 12. NYSHIELD TM CONTROL NYSHIELD™ MASS LOSS = 51% END OF TEST STEEL FASTENERS ON MAGNESIUM, 26 DAY EXPOSURE 12 Test plates bead blasted to view corrosion effects CONTROL NYSHIELD™ CONFIDENTIAL At the 5 year simulation, a plate was removed from the corrosion chamber and bead blasted to get rid of corrosion products (left photo). Then the bolts were removed to show the Mg substrate underneath the bolt (right photo).
- 13. NYSHIELD TM MASS LOSS = 102% END OF TEST STEEL FASTENERS ON MAGNESIUM, 50 DAY EXPOSURE 13 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 10 years field exposure.
- 14. NYSHIELD TM MASS LOSS = 102% END OF TEST STEEL FASTENERS ON MAGNESIUM, 50 DAY EXPOSURE 14 CONTROL CONTROL NYSHIELD™ NYSHIELD™ Test plates bead blasted to view corrosion effects CONFIDENTIAL At the 10 year simulation, a plate was removed from the corrosion chamber and bead blasted to get rid of corrosion products (left photo). Then the bolts were removed to show the Mg substrate underneath the bolt (right photo).
- 15. NYSHIELD TM MASS LOSS = 161% END OF TEST STEEL FASTENERS ON MAGNESIUM, 78 DAY EXPOSURE 15 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 15+ years field exposure.
- 16. NYSHIELD TM MASS LOSS = 162% END OF TEST STEEL FASTENERS ON MAGNESIUM, 78 DAY EXPOSURE 16Test plate on right bead blasted to view corrosion effects CONTROL CONTROL NYSHIELD™ NYSHIELD™ CONFIDENTIAL At the 15+ year simulation (end of test), this final plate was removed from the corrosion chamber. The right photo shows the plates after the bolts were removed to reveal the Mg substrate underneath the bolt (right photo). Note that the control fastener completely destroyed the magnesium, whereas the plate under the NYSHIELDTM coated fastener is not damaged. Video - Mg
- 17. NYSHIELD TM 17 CORROSION CHAMBER TEST RESULTS CONTROL VS. NYSHIELDTM ON CARBON FIBER PER GMW17026 CONFIDENTIAL NYSHIELDTM coating also performs very well against carbon fiber.
- 18. NYSHIELD TM MASS LOSS = 48% END OF TEST STEEL FASTENERS ON CARBON FIBER, 20 DAY EXPOSURE 18 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 4 years field exposure.
- 19. NYSHIELD TM MASS LOSS = 105% END OF TEST STEEL FASTENERS ON CARBON FIBER, 45 DAY EXPOSURE 19 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 10 years field exposure.
- 20. NYSHIELD TM MASS LOSS = 173% END OF TEST STEEL FASTENERS ON CARBON FIBER – 75 days 20 CONTROLGMW3359FINISH NYSHIELD™GMW3044FINISH CONFIDENTIAL This photo represents approximately 15+ years field exposure. video
- 21. NYSHIELD TM COF TEST & RESULTS CONDITIONS: • M10 X 1.5 X 40 WILSON GARNER G9.8 PLAIN TEST BOLT • ZINC PLATED WASHER • RUNDOWN: 30 RPM/TIGHTENING: 30 RPM • SHUT OFF VALUE: 50 NM • NYSHIELD TM WITH TORQUE MODIFIER APPLIED 21 Coefficient of Friction values are able to be tuned as necessary to fit within the desired 0.10 – 0.16 range COF TESTING PERFORMED ON RS TORQUE TENSION EQUIPMENT CONFIDENTIAL SAMPLE # COEFFICIENTOFFRICTION CONFIDENTIAL
- 22. NYSHIELD TM TENSION LOSS TEST & RESULTS TEST PARAMETERS • M10 FASTENER TIGHTENED TO 55 NM • COATING THICKNESS 50-75 MICRONS • ULTRASONICS USED TO MEASURE TENSION LOSS • RAN 25 NYSHIELD SAMPLES, AND 5 CONTROL WITH GMW3044 FINISH 22 SAMPLE # TENSIONLOSS NYLOK EVALUATED THE RELATIONSHIP BETWEEN CREEP OF NYSHIELDTM VS CONTROL AT ELEVATED TEMPERATURE OVER TIME. NOTE: SAMPLES TIGHTENED TO 55 NM INITIALLY. AFTER TEST, THE BREAK LOOSE TORQUE WAS 65 NM OR GREATER. THIS INDICATES MINOR ADHESION BETWEEN THE NYSHIELDTM AND STEEL. CONFIDENTIAL NYSHIELDTM coating underneath the fastener flange does not cause significantly more tension loss at 150C/1000 hours oven conditioning than an uncoated control bolt.
- 23. NYSHIELD TM COATING UNIFORMITY • TYPICAL THICKNESS IS 50-75 MICRONS • NO INTERFERENCE WITH HEX OR TORX DRIVE • RESPONSIVE MAGNETIC PROPERTIES 23 Cross-section Cross-section Cross-section CONFIDENTIAL NYSHIELDTM coating is very uniform. Even in fastener recesses, such as an internal torx drive, it doesn’t interfere with the tool used in driving.
- 24. NYSHIELD TM TAPE ADHESION TAPE ADHESION TEST PARAMETERS • 10 DAYS @ 40°C IN 100% RH CHAMBER • CROSS HATCH CUT IN COATING - SEE BLUE CIRCLES BELOW • TAPE PULL 1 HOUR AFTER REMOVAL RESULTS • NO REMOVAL OF COATING CONTROLLEDRELATIVEHUMIDITYCHAMBER TAPE ADHESION (GMW14829) 24 NYSHIELD™ GMW 3044 FINISH CONFIDENTIAL NYSHIELDTM coating has good adhesion to the fastener substrate.
- 25. NYSHIELD TM CHEMICAL RESISTANCE TEST • 24 HOUR SOAK AT ROOM TEMPERATURE - ENGINE OIL (ALSO 2 HR ELEVATED 82°C) - COOLANT - TRANSMISSION FLUID - POWER STEERING FLUID - WINDSHIELD WASHER FLUID • 2 HOUR SOAK AT ROOM TEMPERATURE - E10 FUEL - E85 FUEL - DIESEL FUEL RESULTS • NO VISUAL CHANGE IN COATING APPEARANCE • NO NOTICEABLE SOFTENING OF COATING 25 CONFIDENTIAL NYSHIELDTM coating has very good chemical resistance to typical automotive fluids.
- 26. NYSHIELD TM CHEMICAL RESISTANCE TEST CONTINUED 24 HOUR SOAK AT ROOM TEMPERATURE - VEHICLE CLEANING AGENT - TRANSIT COATING / PROTECTIVE WAX - CAR SHAMPOO - PAINTWORK CLEANING PRODUCT 2 HOUR SOAK AT ROOM TEMPERATURE - WINDEX - RAIN-X 2-IN-1 GLASS CLEANER - REMOVER FOR TRANSIT COATING - WASHER FLUID - 10 MIN SOAK AT ROOM TEMPERATURE - TAR AND ROAD OIL CLEANER - CHROME CLEANER 26 TESTED PER GMW 14334 RESULTS: - NO VISUAL CHANGE IN COATING APPEARANCE - NO NOTICEABLE SOFTENING OF COATING CONFIDENTIAL NYSHIELDTM coating has very good chemical resistance to typical automotive cleaners.