海水液压阀口材料腐蚀特性研究

Study on the Corrosion Characteristics of Valve Portmaterial in Seawater Hydraulic Valves

海水具有强的电化学腐蚀性、高的汽化压力以及较大的密度、弹性模量大,当其在阀体内部流动时,将不可避免地引起还水液压阀口材料的化学腐蚀和电化学腐蚀,使材料表面遭到破坏,材料力学性能下降,导致液压阀使用寿命的急剧降低。因此,研究材料在海水中的腐蚀机理,为海水液压阀筛选耐腐蚀性强的材料是亟待解决的关键问题之一。该文针对不锈钢在海水中的腐蚀机理进行介绍,并通过化学浸泡试验、电化学腐蚀试验对几种常用不锈钢在海水中的耐腐蚀性能进行比较研究,为海水液压阀关键零部件材料筛选提供一定的理论依据。

Sea water has strong electrochemical corrosion, high vaporization pressure, large density- and large elastic modulus. When it flows inside the valve body, it will inevitably cause chemical and electrochemical corrosion of the material of the hydraulic valve mouth, which causes the surface of the material to be destroyed and the material performance decline, resulting in a dramatic decrease of the hydraulic valve life. Therefore, studying the corrosion mechanism of materials in seawater is one of the key problems to be solved urgently for screening seawater corroded materials with corrosion-resistant materials. In this paper, the corrosion mechanism of stainless steel in sea water is introduced. The corrosion resistance of several common stainless steel in seawater is compared by chemical immersion test and electrochemical corrosion test. The theoretical basis is provided for the selection of the key paris of the seawater hydraulic valves.