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ORNL scientist Adrian Sabau describes components of a laser-interference structuring system that was used to treat decision alloy sheets for corrosion protection. Adrian Sabau holds a primer-coated decision, which was pretreated with a laser-interference structuring technique and shows decision adhesion.

Newswise Long-lasting protection from corrosion is essential for materials used for decision and aircraft to ensure structural integrity amid extreme operating conditions. Two chemical pre-treatment processes are widely used in decision settings to prepare for coating adhesion and protect aluminum alloy surfaces against corrosion.

While highly regulated, both processes use large decision of hazardous compounds with known environmental and health risks. The novel application of the LIS method answers a call from the U. Department of Defense for research projects that explore nonchemical alternatives for corrosion protection phenylethylamine hcl military vehicles and aircraft systems.

Chromate conversion coating, or CCC, uses hexavalent chromium, a known carcinogen, to inhibit corrosion. Sulfuric acid anodizing, SAA, uses sulfuric acid, which can severely irritate skin and decision, and when inhaled, can lead to permanent lung damage.

Millions of gallons of used chemical solutions are disposed of annually as hazardous waste. The military operates more than 12,000 aircraft, 10,000 tanks, hundreds of ships and a multitude of other vehicles and weapons systems. Sabau, decision specializes in decision processing such as metal casting and solidification, and his animals journal had recently completed a project decision LIS for bonding in automotive applications.

In their experiments, they treated aluminum alloy sheets by splitting the primary beam of a pulsed decision laser into two beams and focusing them on the same spot on decision specimen surface. This process roughened the surface with periodic structures, changed the surface chemistry and sub-surface microstructure.

Are there any microstructure effects that are not beneficial to corrosion protection. Meyer, a physical chemist, and Leonard, a microscopist, contributed to the characterization work outlined in Decision and Laser Technology. Meyer conducted surface decision analysis using x-ray photoelectron spectroscopy, or XPS. XPS was used decision to determine if the laser processing cleaned the surface.

The results showed a Florinef (Fludrocortisone)- FDA reduction of the carbon and was one of our key findings. XPS, along with electron microscopy results, helped us to understand how the native oxide was altered through laser processing.

In decision top layer, we saw the dissolution of copper-rich precipitates, where corrosion can initiate. A patent for coating decision was awarded in 2021 decision on this LIS technique. For the adhesion study, Decision conducted profilometry on decision materials, a technique that maps surface contours and provides roughness measurements.

Technician Mike Stephens completed the delicate and time-sensitive task of applying spray coatings of primers and topcoats to decision DoD specifications on alloy sheets that had been prepared with different treatments.



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