We know that Aluminum has 8 series alloys and these alloys have a different composition. The effect of each of these elements on preparation (surface treatment as physically and as chemically) can be different, so it's very important to choose the best method of preparation for applying the coating such as epoxy coating primer
Cr(VI) is still the best, but I hear there is progress and methods available for laser surface treatments.
http://www.surfacetreatment.nl/public/files/files/Chromating%20(chromate%20conversion%20coating).pdf
https://www.escholar.manchester.ac.uk/api/datastream?publicationPid=uk-ac-man-scw:189196&datastreamId=FULL-TEXT.PDF
I don't want to use conversion coating
I wanna use acidic or alkaline solution(like desmuting solution) for treatment.
I don't know choose correctly solution(time-temperature)for this alloy
Hello, Ms. Sadati.
You can try Plasma electrolytic Oxidation (PEO) method. It is one of the simplest surface treatment on Al and its alloys, employing alkaline electrolyte (considered environmentally friendly as compared to acidic electrolyte) and high voltage. The results would be thick, high adhesive, and corrosion resistant coatings, which would be applicable in high temperature as well as corrosive environments.
The sintered aluminum powder is obtained by pressing (700 MPa) at an aluminum powder temperature of 500-600 ° C. Sintered aluminum powder is characterized by high strength and heat resistance up to 500 ° C
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