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Protect Carbon Steel from rusting during immersion

I have some large (14 ft long) pieces of carbon steel which will be immersed in 4.0 pH water for 15 - 20 days. I am trying to prevent rusting. I am looking a phosphatizing, Black Oxide and electroless nickel coatings as possible answers. Which is the best and why? I have the option of raising the pH but that gets more complicated. I cannot use oils to seal the surfaces - the coating must do the entire rust prevention.

Art Krenzel
Phoenix Technologies - Battle Ground, Washington
2000

Of the choices listed, EN is the best by several orders of magnitude, assuming that the pH is not from nitric acid. citric acid might cause a problem.

Is a heavy coat of an appropriate formulation of powder coat an option? Would probably last longer in some cases and should be cheaper.

James Watts
- Navarre, Florida
2000

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