Home /
Search 🔍
the Site

Chime right in! (no registration req'd)


"Residue from sandblasting aluminum parts prior to Alodine coat"


I am a Planner for an industrial rebuild facility . I have some aluminum tubes that go on an air cycle unit. We have tried to bead blast these parts before Alodine but sand was left in them and caused clogs when the air cycle unit was built. Is there any type of sandblast procedure that can be used that won't leave a residue? Or is there a cleaning procedure that can be done to remove residue?

Tina Leemaster
Tank Rebuild Facility - Anniston, Alabama

First of two simultaneous responses -- 2005

I would hope, for your sake, that the treatment house that applies the coating would at least have the ability to pre-clean prior to Alodine.
In its simplest form the parts should be preliminary cleaned using an alkaline soak cleaner, well rinsed in water, etched, rinsed well in water before the Alodine. This should remove any blast material from any simple form sheet or tube.
If shapes are complex, with blind holes or narrow bores there is always a chance of entrapment. In these cases I would avoid blasting of at all possible and rely on a really good etch.

Brian Terry
Aerospace - Yeovil, Somerset, UK

Second of two simultaneous responses -- 2005

How big are your parts? I suggest you use a mass finishing system if possible. If not, bottom line here is that all material are porous and blasting systems are good at getting into porous surfaces, but not good at getting out of them because of their irregular sizes and shapes due to break down. Best way to remove is to run parts through an ultrasonic system or high pressure or heated water system, in that order.

tony kenton
AF Kenton



Any kind of blasting or tumbling will imbed all sorts of organic and inorganic junk into the Kleenex-like soft spongy aluminum metal. Iron bearing media is the worst. Aluminum Oxide blasting is the least bad. Then as someone said above - etch as deep as you can stand to remove imbedded soil.

robert probert
Robert H Probert
Robert H Probert Technical Services
supporting advertiser
Garner, North Carolina

Q, A, or Comment on THIS thread SEARCH for Threads about ... My Topic Not Found: Start NEW Thread

finishing.com is made possible by ...
this text gets replaced with bannerText
spacer gets replaced with bannerImages

Disclaimer: It's not possible to fully diagnose a finishing problem or the hazards of an operation via these pages. All information presented is for general reference and does not represent a professional opinion nor the policy of an author's employer. The internet is largely anonymous & unvetted; some names may be fictitious and some recommendations might be harmful.

If you are seeking a product or service related to metal finishing, please check these Directories:

Chemicals &
Consult'g, Train'g
& Software

About/Contact    -    Privacy Policy    -    ©1995-2021 finishing.com, Pine Beach, New Jersey, USA