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There are many different alloys available to engineering for structures, systems and components for use in seawater. These include steels, stainless steel and alloys of copper, nickel, aluminium and titanium. All can be capable of good performance if their corrosion behaviour is understood and they are selected and designed to their strengths and not their weaknesses. Many systems are mixed metal and knowledge of the galvanic compatibility of alloys in contact with each other is also crucial.
Different alloy groups have different methods of corroding depending on the sea conditions. Flow, temperature, stagnation, pollution, and applied stresses can all produce a different response. Some alloys can show uniform thinning while others may show localised corrosion which can include corrosion at crevices, pitting, stress corrosion and corrosion of preferential phases.
This presentation provides a brief overview of the world of metals and their response to one of the most aggressive environments there is, giving examples of the types of corrosion which can occur and how to avoid them.
Carol Powell |
Consultant to the Nickel Institute |
Carol Powell has been an independent consultant for 30 years and has specialised in stainless steels, copper and nickel alloys. Over this time, she has been involved in development projects for the Nickel Institute involving the water, nuclear and marine industries. She also ran the Copper-Nickel Task Group for the Copper Development Association for over 10 years.
Earlier in her career, she worked 8 years, first in the corrosion laboratories and then as a marketing engineer for a high nickel alloy manufacturer and then 5 years for a firm of engineering consultants to the Royal Navy. Carol has a BSc in Metallurgy and Science of Materials, and is a Fellow of the Institute of Materials, Minerals and Mining. She has written over 40 papers and publications and been a member of the MCF since its inception.
QA ICorr MCF 30 04 20 Carol Powell NI Rev.0 (pdf)
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