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Title: Erosion-corrosion of marine alloys
Author: Meng, Hang
ISNI:       0000 0004 2681 714X
Awarding Body: University of Leeds
Current Institution: University of Leeds
Date of Award: 2009
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Marine alloys such as stainless steels, copper-base alloys and cast iron have a long history of applications over a wide range of industries. They always are exposed to aggressive erosion-corrosion environments to support or transmit forces during the service, where more than millions of pounds are involved to repair the material degradation every year. In order to minimize this cost, lots of money and research have been put into practice, from which more and more erosion-corrosion behaviour and mechanisms of marine alloys were understood, however, downtime of marine systems still happens, moreover it is still a fact that it is quite difficult to choose the optimum material for the specific working environment. In this project, erosion-corrosion performance of eight marine alloys which include three different grade stainless steels, four copper-base alloys and one Niresist cast iron has been assessed under liquid-solid jet impingement over eight sets of test conditions in 3.5% sodium chloride solution. Firstly, the weight loss of different marine alloys ranks the priority of their corrosion, erosion and erosion-corrosion resistance over the range of the test conditions, furthermore the total weight loss test, in conjunction with in-situ electrochemistry measurements, enable the relative contribution of the different mechanisms interacting in the degradation to be quantified, meanwhile the aspects of erosion-corrosion mechanisms of different marine alloys have been detailed. Even erosion-corrosion is a complex process, but microhardness has been found to be the controlling factor in severe erosion-dominated conditions. More importantly, primary concerns have been brought on the factorial contributions of individual environmental parameters and their interactions to the overall material degradations. A full two-level factorial experimental design method combined with following analysis of variance was applied to qualify these factorial contributions, which shows effects of the individual environmental parameters and their interactions on the weight loss during the erosion-corrosion processes, and the prominent factors are velocity, sand loading and their interaction. Fluid temperature has the smallest effect compared with other environmental parameters.
Supervisor: Neville, Anne ; Hu, Xinming Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available