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Recent content by BarryMartin

  1. BarryMartin

    steel protective coatings

    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...
  2. BarryMartin

    epoxy coated rebar

    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...
  3. BarryMartin

    SS groundwater well screen

    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...
  4. BarryMartin

    What is the best material to use?

    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...
  5. BarryMartin

    Copper corrosion

    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...
  6. BarryMartin

    copper protection

    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.
  7. BarryMartin

    storage tank for sulfuric acid! immediately

    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...
  8. BarryMartin

    copper protection

    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...
  9. BarryMartin

    Industrial Bleach in Cooling Towers?

    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...
  10. BarryMartin

    I have a titanium part that is glas

    To remove embedded material you might try pressure washing the surface or using a short etch to remove any residual material.
  11. BarryMartin

    Cadmium plating hi tensile studs

    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...
  12. BarryMartin

    galling of titanium

    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
  13. BarryMartin

    Anodize Aluminum Electrical Bus

    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...
  14. BarryMartin

    Cadmium plating hi tensile studs

    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.
  15. BarryMartin

    Corrosion of SS fixtures in water valve house

    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...
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