A combination of coating plus cathodic protection is usually optimum for the life of structure. You can reference underground gas pipelines.
A well coated structure would have 1~3% holidays that the cathodic protection would protect. Otherwise you have the expense of trying to ensure a...
I believe epoxy coated rebar came into use as a response to the problem of corrosion of reinforcing steel in bridge decks. The initiator was the increased use of deicing salts, penetrating the concrete and breaking down the passivating film that forms on steel in concrete due to alkalinity. In...
You may have a good point. If you have an impressed current system installed, you will deposit materials onto cathodic sites. The question remains: How significantly will your monitoring results be effected?
I do not understand the equipment arrangement. I do not know what is being...
Anodizing is used for a variety of purposes and special solutions are available. If the entire part is to be treated and you have many parts the a tank anodizer would be a good bet. If you only need part of the piece to be hardened and have a relatively small volume of parts, then selective...
I am surprised to hear that you have a problem. I'd consider first, the thickness and porosity of the silver deposit. You should be able to obtain an essentially pore-free deposit with adequate thickness.
An alternative to consider for less money is nickel. Depending on current densities, it...
Nickel is used for electrical contacts to improve the initial and long term contact resistance of copper. For higher current densities, you might consider silver, but nickel is quite good.
You might try stainless steels like 316 depending on concentration and temperature. If it is a storage tank for ambient conditions, say <120F, then 316 is good below 10% and would be good up to 25% at 75F. I'm referencing an old DuPont handbook. Also, mentioned are aluminum, copper, monel, Al...
Consider plating a barrier coating of nickel to prevent corrosion. Pore free layers can be quite thin.
What considerations do you have? e.g., cost, temperature, environment, size of tubes, any other technical concerns about a coating on tubes.
I suspect that this might be a type of heat...
You don't mention the capacity required for your system.
As others have stated, bleach will kill most of the bugs and is commonly used as a biocide in many forms. Chlorine gas, sodium hypochlorite (bleach) in a liquid form, and onsite electrolysis of salt water solutions to generate bleach...
I think I missed the question. Concern is whther the cadmium plating protects the high tensile substrate from hydrogen embrittlement when it is subsequently part of a cathodically protected subsea pipeline.
I would have concern about high strength materials in these applications, if you...
You might consider plating another material like silver onto the stainless steel for anti-galling action.
www.brushplating.com is a good site for selective plating
Check out www.brushplating.com.
Electroplating provides options for anodizing aluminum or applying a metallic coating as a barrier layer. For example, a pore-free nickel layer a few thousandths thick would provide a barrier layer for corrosion and a good long term electrical contact...
Cadmium can be plated without hydrogen embrittlement. This is done for aircraft industry.
For info. contact Ron Saleker of Sifco Selective Plating 216-524-0099.
Have you considered electropolishing the stainless steel? Rather than simple chemical pickling the metal can have an applied electrical current in combination with a solution to electropolish the surface. This is commonly done in pharmaceutical industry to provide a mirror finish which means...
