The polished surface of the duplex stainless steel has stains under the optical microscope, and the ultrasonic cleaning effect is not ideal. How to solve it?
Article Metallurgical and Electrochemical Properties of Super Duplex...
For the metallography of the base SDSS and the LCS substrate, all the samples were ground up to 2000 grit size SiC abrasive paper, and cloth polishing up to 0.05 μm sized alumina particle water suspension, and lastly, the specimen was degreased by ultrasonic cleaning in an isopropanol bath for 5 minutes. To reveal the microstructure, the base SDSS was electrochemically etched with a 50% KOH solution at 5 V for 10 seconds, and the LCS was chemically etched with 2 vol.% nital solution.
TRY POST CMP CLEANING PROCESS.
MEGASONIC CLEANING, is a noncontact mode of cleaning,is commonly used as a means to apply such physical force to surfaces.
The most important aspect of megasonic cleaning is the reduction of boundary layer thickness. Eckart streaming mainly reduces the diffusion boundary layer thickness and thus enhances the chemical reactivity at the interface. Schlichting streaming, also called boundary layer streaming,enhances the particle removal within the viscous boundary layer by a rolling mechanism.
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