Hi Tower Talkers, It seems that sacrificial zinc is commonly used in boating to stop corrosion. The sacrificial zinc corrodes and "saves" the metal to which it is attached. Does anyone in TowerTalk l
The MIL-HDBK-419A talks a little about this topic. Adding Zn electrodes to a galvanized tower creates a parallel circuit, not clear which will go first IMO. Impressed voltage systems are probably a b
That is what galvanizing does. The zinc acts as a sacrificial metal to protect the underlying iron/steel and thus acts as a sacrificial anode. In the event the underlying metal becomes exposed, prote
Hi Grant, Thanks for your response. At our station in PJ4, the Hot Dipped Galvanizing is holding up well, but some parts are Electro-Galvanized and are already corroding. Part of the problem is erosi
There are different quality grades on hot dipped galvanizing. Those quality grades are basically the size of the zinc layer. For hard enviroment areas, galvanizing is thicker. For extra protection, a
Correct on the paint, Máximo. I painted my P4 Rohn 55G tower often. In theory the hot dipped galvanizing protects the steel and the paint protects the galvanizing from the corrosive environment. The
If you've got galvanic corrosion, you guys are correct. That takes a dissimilar metal pair, or 3 if you add a sacrificial anode, and an electrolyte. Read that last part again. Without your electrolyt
John, What type of paint you used? Have you tried urethane aliphatic enamel? 73, Maximo EA1DDO Correct on the paint, Máximo. I painted my P4 Rohn 55G tower often. In theory the hot dipped galvanizing
Neat Topic -- I wonder if anyone has looked at active cathodic protection, like used in the pipeline business? 73, Joe kk0sd --Original Message-- From: TowerTalk <towertalk-bounces@contesting.com> On
Perhaps there is better paint, I used BriteZinc which is a zinc enriched paint. It was a lot of work and still corrosion was winning the battle. I am not sure what paint PJ4G uses but it is very very
Actually, painting your anodic material is the LAST thing you want to do if you have a big galvanic potential between 2 metals and an electrolyte (i.e. galvanic cell). When you have a coating defect,
I don´t think that type of paint is the correct for this task. I would suggest to ask for "urethane aliphatic enamel", in two-components (base and hardener, to mix before to use it). You can select t
I'm using some of the KBS products to clean and seal rust on a tower I'm going to put up soon. They have a wide variety of products, some of which are designed for automotive uses such as frame rail
Thanks to John and Maximo (and others) for your responses. Would I be correct to think that the choice of paints depends on how much corrosion is already present? The BriteZinc might be for galvanize
I think so. Brite-Zinc seems to me like an anti-rust paint, for protection. Usually on steel. Urethane aliphatic enamel is a synthetic cover to give an extra protection layer on the top of the zinc.
OK that makes sense. One additional question: We are using AB-105 towers. They are constructed by bolting together vertical, horizontal, and diagonal parts. I am imagining that the use of the urethan
Brite-Zinc seems to me like an anti-rust paint, for protection. Usually on steel. Urethane aliphatic enamel is a synthetic cover to give an extra protection layer on the top of the zinc. Professional
Rich, it's difficult to get everything. When you install a tower, paint it, etc. usually you are not thinking on disasembly it again. Said that, it is paint, not welding. I can't say for sure, but I
That could be a problem with hard paint. There are a lot of commercial painted towers, I wonder if they have problems removing bolts. I used BriteZinc on my Aruba tower which is mostly soft zinc. Bec
"Perhaps there is better paint, I used BriteZinc which is a zinc enriched paint. It was a lot of work and still corrosion was winning the battle. I am not sure what paint PJ4G uses but it is very ver