re-occur
2. How much White rust?
3. How mush of teh orginal galvanizing remains? (Measure the thickness with
a device like a Positech 6000)
4. If sufficnet Galvanizing remains the white rust can be removed by a
stiff brush (Plastic or brass Not Steel).
5. Individual sheets are cut from rolls of galavized material,
re-galvanizing a complete sheet muight be possible in a Hot-Dip tank.
6. there are several methods for repairing, eithar a cold zinc rich paint
system applied to the surface of a Tin/Zinc solder based solder applied
with heat.
To make a paint repair look acceptable , paint the surface, when partially
dry use a scotchbrite (
http://img.epinions.com/images/opti/dc/d0/Scotch-Brite_Heavy_Duty_Scour_Pads
-resized200.jpg ) cleaning pad to blend the surrounding area.
Life - depends on envirnomental conditions.
Best Regards,
Richard M. Beldyk PhD, PE, MIET
AWS Certified welding Engineer
ASQ Certified Six Sigma Black Belt
Original Message:
-----------------
From: Mrityunjay Kumar / ZS Saudi PEB QA/QC Mrityunjaykumar@zamilsteel.com
Date: Mon, 24 May 2010 14:49:13 +0300
To: materials-welding@googlegroups.com
Subject: [MW:5230] Repaire of Damaged Galvanised Sheet
Dear Friends,
Please advise me whether
1. we can repair the white rusted GI sheet (Thick 1 - 3.00 mm, ASTM
A653, Gr-S340)
2. or can we re-galvanize the sheet
3. or for few spots, shall we use some spray but for this A) How to
clean B) its life & C) visual appearances
Best Regards,
M.K.Choudhary
[cid:image001.png@01CAFB4F.6CB12FA0]
P.O. Box 877, Dammam 31421 KSA
Phone : (+9663) 8471840 X 555
Fax : (+9663) 8471291
www.zamilsteel.com
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