Dear Muhammad Ali, the RG free access document presents different techniques. Many other references are also available via simple search. My Regards

https://www.researchgate.net/publication/282241753_Treatment_Techniques_on_Aluminum_to_Modify_the_Surface_Wetting_Properties

Abdelkader BOUAZIZ Thank you

You can see the following links:

1. https://www.aculon.com/hydrophilic-coatings/

2. https://patents.google.com/patent/WO1993010827A1/en

Dear Muhammad Ali thanks for posting this very interesting technical question on RG. Personally I'm not a proven expert in this field of research as we work in the area of synthetic inorganic / organometallic chemistry. However, I would like to suggest to you a few relevant literature references which might help answering your question. Please have a look e.g. at the following article:

Process for making metal surfaces hydrophilic and novel products thus produced

This is a patent which is freely available as public full text (please see the attached pdf file)

Also very interesting is the following RG link:

A Superhydrophilic Aluminum Surface with Fast Water Evaporation Based on Anodic Alumina Bundle Structures via Anodizing in Pyrophosphoric Acid

Article A Superhydrophilic Aluminum Surface with Fast Water Evaporat...

Also please check this paper which I added as attachment:

Treatment Techniques on Aluminum to Modify the Surface Wetting Properties

http://przyrbwn.icm.edu.pl/APP/PDF/128/a128z1p09.pdf

I hope this will provide you with some ideas of how to make Al surfaces hydrophilic. Good luck with your work and best wishes, Frank Edelmann