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Ted Mooney, P.E. RET
Pine Beach, NJ
The authoritative public forum
for Metal Finishing since 1989
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Teflon coating for heat exchanger plates
Q. We make heat exchangers using Copper and Stainless Steel. We are experiencing accelerated deposits forming on the heat exchanger plates. Major constituents of the deposit are Calcium, Magnesium, Iron, Silicon. We notice faster deposit formation on Copper plateds and somewhat less on Stainless steel.
Can any of the readers suggest a coating that will retard the deposit formation? Will coating such as Teflon work? How about inorganic coatings such as Titanium Nitride or Boron Nitride work? Treating the incoming water for hardness is not an option for us. Thanks in advance for your help.
Gowri Sankar- Nashua, New Hampshire
2003
A. The first thing I'd do is get some of the stainless parts electropolished and see if that makes a big enough improvement. If so, copper can be electropolished too.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com - Pine Beach, New Jersey
2003
A. You can coat these areas with one of teflon brands as PFA or ETFE. This means you have to heat the coat and the system for curing. You have to worry about system leaks . I think it maybe is easier to put the aggressive environment in the outside, for the purpose of easier coating. The benefit is a coating with higher molecular bond and less surface tension.
Yours
Ahmed Agamieh- Cairo, Egypt
2004
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