Glass Bead Blasting

[MJScanlon]

I am cleaning die castings via Glass Bead Blasting prior to clear chromate finish. Is there any mil or equivalent specs that I can put on my drawing?

Or simply put Glass Bead Blast


Thanks,

Mark

 

[kenvlach]

It is important to specify clean glass bead, or at least glass bead that hasn't been used upon any other metal, when bead blasting Al, Zn or SS.
Many shops have one bead blaster dedicated to steel and iron, and another for the whatever metal they use that must be kept clean of embedded Fe.

 

[kenvlach]

Looked up some specifications:

ASTM B252-92(1998) Standard Guide for Preparation of Zinc Alloy Die Castings for Electroplating and Conversion Coatings. Paragraph 7.4 discusses shot peening and potential problems thereof (smearing over of porosity). It refers to MIL-S-13165C for details. Doesn’t mention glass beads.

B253-87(1999)e1 Standard Guide for Preparation of Aluminum Alloys for Electroplating. “If aluminum oxide, or glass beads are used, subsequent treatments should include the use of an acid fluoride to ensure that any embedded aluminum oxide or silica is removed.”

MIL-S-13165C SHOT PEENING OF METAL PARTS (S/S BY SAE-AMS-S-13165). No longer available from the ASSIST site, so $ from

http://www.sae.org

MIL-G-9954A GLASS BEADS, FOR CLEANING AND PEENING (S/S BY SAE-AMS2431). Still available from ASSIST for free:

http://assist1.daps.dla.mil/quicksearch/

MIL-STD-852 GLASS BEAD PEENING PROCEDURES (NO S/S DOCUMENT). Still available from ASSIST.

Hope this helps,
Ken