plating, anodizing, & finishing Q&As since 1989
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
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