Corrosion Mechanism Analysis and Improvement Measures of the Butterfly Valves in Seawater Cooling System of a Certain Vessel
In response to the severe corrosion of the butterfly valve in the seawater cooling system of a certain vessel,the corrosion mechanism of the seawater cooling system was analyzed,and corresponding anti-corrosion measures were proposed.Af-ter visual inspection,chemical composition analysis,metallographic examination and electron microscopy,the corrosion reasons were gradually investigated,finding that the cooling rate of the butterfly valve disc is not properly controlled in the process of heat treatment,so as to form the metastable structure,and the corrosion of decomposition and oxidation occurs in the seawater cooling system are the key corrosion factors.In the subsequent process of ship design and construction,improvement measures and sys-tem solutions for anti-corrosion of seawater cooling systems were provided from the aspects of pipe and accessory material require-ments,seawater design flow rate,system scheme,pipe manufacturing process,and marine growth prevention system.
NETL
NSTL
万方数据
