Letter 23984

Thesis about aluminizing  

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Dear sirs,

Kindly inform you that I am a student and my thesis is about aluminizing process and equipment, I have a little information about it , if you know something about it(specialy about the companies who sell its equipment)please send me that.

With the best regard,

Leila Akbari
Iranian Univercity of Science and Technology - Arak, Markazi, Iran

There are several very diverse aluminizing processes:

Hot-dip. Similar to hot-dip zinc galvanizing. See the GALVANIZING, ALUMINIZING, HOT TIN DIPPING’ area on this site.

Hot spray. Deposition using a flame or electric torch.

Pack metallization. Diffusion of Al vapor into a substrate from a high temperature mixture containing Al, a halide and an inert ceramic. Similar to Sherardizing process for zinc coating.

Vacuum metallization. Either Al evaporation or ion implantation. Highly reflective, and can be performed on plastic, glass, etc. E.g., see Letter #23827 (http://www.finishing.com/238/27.shtml) and Letter #23383 (http://www.finishing.com/233/83.shtml).

Electrodeposition. Rarely done, requires an organic solvent and protection from water and oxygen (glovebox work).

I suggest an Internet search on the particular topic of interest.

Ken Vlach - Goleta, California

Editor's Note: March 2004 edition of Metal Finishing Magazine contains an article by Dr. Benu Chatterjee on sherardizing, page 40.

Aluminizing is coating of steel (sheets) in molten bath of Al-Zn coatting. There are 2types of procces.1-batch hot dip.2-continouse. I have done resarch on the batch type with the follwing:withdrawal rate=15cm/min.preheating temp.500 c .superheat temp.=50 c above the liquidus temp.these are fixed parameters.the process variables are the Al content0,2,4,6,8,10,45.dont try above than 8 because the molten bath becomes aggrassive.Dipping time 1-5 min.
The procees as follow:1 sample prepration(..cleaning,pecling,fluxing).2 drying 3 imerssing the sample

Eng Fraj
- Kuwait

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