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Electroless nickel for oil industry valves

hi
please guide me about this question: Ni-zn-p coatings are sacrificial but Ni-p-sic or Ni-p-sio2 coatings are barrier against corrosion, which one of these coatings are better for oil industry(valves)?

Taher Rabizadeh
student - Tehran, Iran
August 28, 2008

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