September's speaker is Dev Chidambaram, the winner of the NYSAS 2003 Graduate Student Award.
Date: Wednesday, September 17, 2003
19 Livingston Ave.
Dobbs Ferry
914-693-3192
Meeting Agenda
Arrival: 5:30 - 6:15 pm Cash Bar
Buffet Dinner: 6:15 -7:30 pm
Speaker 7:30 - 8:45 pm
Cost: $30.00 per person
RSVP to by September 15 if you plan to attend.
NYSAS meetings are open to nonmembers.
Applications of Spectroscopy to Corrosion and Coatings
Dev Chidambaram
Department of Materials Science and Engineering
State University of New York at Stony Brook,
Stony Brook, NY 11794-2275.
Understanding the mechanism of inhibition of corrosion by carcinogenic chromates is critical to the development of environmentally safe coatings containing benign chromate substitutes. Novel techniques and improved experimental protocols have been developed to overcome the shortcomings of the surface analytical methods currently used to investigate aluminum-copper alloys and chromate conversion coatings (CCC). Using synchrotron infrared micro spectroscopy (SIRMS), the ASTM recommended acetone degreasing was shown to initiate pitting of aluminum alloy AA2024-T3 via photochemical formation of acetic acid. Due to the known tendency for photoreduction of Cr6+(3d0) following soft X-ray dosage during XPS, a novel method has been developed to prevent this reduction. This method yields, for the first time, an accurate determination of the Cr6+ content of a CCC. In addition, this study has pioneered the use of synchrotron radiation based grazing angle infrared spectroscopy (SR-GAIRS) as a method to enhance by an order of magnitude the detection of chromate in a CCC as compared to other infrared spectroscopic techniques.
A novel investigation using XPS has resulted in the first bipolar-film theory-based dual mechanistic model for the protection offered by chromates of aluminum surfaces against chloride ingress. CCCs are considered to have the unique ability to repassivate the surface following a mechanical damage of the corrosion protective coating. Direct evidence for repassivation of AA2024-T3 by chromates has been provided. For the first time, molybdate ions have been found to not only repassivate mechanical damage but at rates significantly faster than chromates and hence represent a potential candidate for benign coating formulation.
Buffet Dinner
Cash Bar
Chicken Francais
Sole Muniere
Veal & Peppers
Lasagna
Fried Shrimp
Salad
Soda
Coffee & Tea
Directions Directions to Rudy's Beau Rivage
From New Jersey: Palisades Parkway North to Tappn Zee Bridge, first exit after the toll, make left at end of exit ramp to Route 9 South. Continue throught Irvington and into Dobbs Ferry. Rudy's is on the right corner of Route 9 and Livingston Avenue. Or George Washington Bridge to Henry Hudson Parkway to Saw Mill River Parkway North, exit #12. Continue straight for 5 lights, 5th light Rudy's is on the left.
From Connecticut: Cross Westchester Expressway - 287 to 87 South (follow signs to NY/Saw Mill River Parkway) to exit 7A to Saw Mill River Parkway, get off exit #17 (Dobbs Ferry - Ardsley), continue straight for 5 lights, Rudy's is on the right.
From Manhattan & Brooklyn: F.D.R. Drive North to New York State Thruway North exit #7 Ardsley. Make right at end of exit and left at first light, continue down Asford Avenue for 7 lights - 7th light Rudy's is on the right.
From Queens and Long Island: Whitestone Bridge to Hutchinson River Parkway North exit #13 Cross County Parkway West to Saw Mill River Parkway North, exit #12, continue down Farragut Parkway for 5 lights, 5th light Rudy's is on the left.
By Train: MTA Metro North Railroad Hudson Line to Dobbs Ferry Station - Rudy's is in walking distance. Cross the street from the train station and go up the stairs. Go to top of the hill and make a right on Livingston Avenue.
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