Sound technical content, curated with aloha by
Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
-----
Fastening a stainless steel frame with galvanized rods and bolts
Hello
I have recently installed a sluice gate made entirely of stainless steel (304SS).
The rods and bolts used to fasten this frame to a concrete wall are galvanized.
The lower portion of this sluice gate will be submerged in water.
I noticed one of the bolts which are submerged in water experiencing premature corrosion. What can be done to prevent the corrosion of the galvanized parts?
Please note this is a fresh water condition. (Ontario, Canada)
Constructor - Trenton, Ontario, Canada
February 25, 2009
March 3, 2009
My advice to to use stainless rods and fasteners. Any zinc finish will suffer the same fate. Zinc finishes protect steel due to their sacrificial nature. The electrolytic cell set up between the stainless and galvanized parts causes the corrosion.
The only other solution would be to coat the stainless gate as well.
David J. Wolf
Medina, Ohio
As stated above use the same metal due to cathodic reaction - even in fresh water. Other option is to insulate the different metals by say coating the bolts. Regards,
Jim Wood- Concord, California, USA
March 5, 2009
September 20, 2009
Yup same as above.
Use stainless rods and fasteners also. Depending on your application you may need to adjust rods/fastener specs to match the strength of the original zinc'd rods/bolts.
Have all the s/s electropolished before put in service to increase the total overall corrosion resistance.
- north Vancouver, BC, canada
Q, A, or Comment on THIS thread -or- Start a NEW Thread