Assessment of Electroless Plating for In-situ Repair of Monel Clad Q1N Steel Hull Valves in VICTORIA Class Submarines

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Authors
  1. Roberge, P.R.
  2. Klassen, R.D.
Corporate Authors
Defence R&D Canada - Atlantic, Dartmouth NS (CAN);Royal Military Coll of Canada, Kingston ONT (CAN) Dept of Chemistry and Chemical Engineering
Abstract
This project was an exploration of the feasibility of repairing Monel-clad Q1N steel valves, in-situ, using electroless nickel (EN) plating. In this technique, a layer of EN is deposited chemically on the damage surface. The resistance of the EN coating to both uniform and localized corrosion was compared with that of Monel using electrochemical techniques (i.e. electrochemical impedance spectroscopy and cyclic polarization), and passive crevice corrosion test. A cleaning technique was developed to allow EN to coat over the bottom of corrosion pits on Monel. The uniform corrosion rate of an EN coating in artificial seawater was measured by electrochemical impedance spectroscopy and found to be less than that of Monel. The tendency towards pitting and crevice corrosion of an EN coating was also found to be better than that of Monel. The main conclusion from this work is that an EN coating would be a viable solution to repair Monel-clad submarine valves. Recommendations were also made to further develop the EN technique to repair Monel-clad Q1N steel valves in situ.

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Keywords
Electroless plating;Nickel plating;Submarine hull valve;Monel;Electrochemical Impedance spectroscopy;Corrosion resistance;Cyclic polarization;Monel;Crevice corrosion;Repair
Report Number
DRDC-ATLANTIC-CR-2004-226 — Contractor Report
Date of publication
01 Sep 2004
Number of Pages
46
DSTKIM No
CA025138
CANDIS No
522686
Format(s):
CD ROM

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