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通过硬度测试、金相显微镜(OM)、扫描电镜(SEM)、X射线衍射物相分析(XRD)、均匀腐蚀和电化学腐蚀实验以及微动摩擦实验等分析手段,研究了锆微合金化铸态镍铝青铜的硬度、组织、均匀腐蚀性能、电化学腐蚀性能和摩擦磨损性能。结果表明:与未微合金化铸态镍铝青铜(Cu-8.87Al-5.22Fe-4.48Ni-1.08Mn-0.53Zn)相比,锆微合金化铸态镍铝青铜(Cu-9.92Al-5.24Fe-4.43Ni-1.07 Mn-0.52Zn-0.045Zr)的相组成没有显著变化,都由α相、β相(高温相)和κ相(包括κI,κII,κIII和κIV)组成,但α相、κIII相和κIV相显著细化。锆微合金化铸态镍铝青铜的硬度由HV212.1提高到HV229.3,比未微合金化铸态镍铝青铜高8.1%,晶粒细化且呈弥散分布是硬度提高的主要原因。由于腐蚀优先发生在共析区域(α+κIII相)内,组织细化降低了该区域腐蚀长通道产生的概率,使得锆微合金化铸态镍铝青铜在3.5%NaCl水溶液中的均匀腐蚀速率和电化学腐蚀速率分别降低到0.022954754和0.26193 mm·a-1(分别降低了5.3%和8.45%);硬度提高、组织细化以及位错强化作用使得锆微合金化铸态镍铝青铜的摩擦系数降低到0.022(降低了12.7%)。
By means of hardness test, optical microscope (OM), scanning electron microscopy (SEM), X-ray diffraction (XRD), uniform corrosion and electrochemical corrosion test and fretting friction test, Nickel aluminum bronze hardness, microstructure, uniform corrosion, electrochemical corrosion resistance and friction and wear properties. The results show that compared with non-microalloyed nickel-aluminum bronze (Cu-8.87Al-5.22Fe-4.48Ni-1.08Mn-0.53Zn), zirconium microalloyed as-cast nickel aluminum bronze (Cu-9.92Al-5.24 Fe-4.43Ni-1.07Mn-0.52Zn-0.045Zr) had no significant change in phase composition, but consisted of αphase, βphase (high temperature phase) and κphase including κI, κII, κIII andκIV, , ΚIII phase and κIV phase were significantly refined. The hardness of zirconium microalloyed as-cast nickel-aluminum bronze increased from HV212.1 to HV229.3, which is 8.1% higher than that of non-micro-alloyed as-cast Ni-Al bronze. The grain refinement and dispersion are the main reasons for the increase of hardness. As the corrosion preferentially occurs in the eutectoid region (α + κIII phase), the refinement of the microstructure reduces the probability of corrosion of the long channels in the region, resulting in a uniform corrosion rate of the zirconium-nickel alloy of as-cast Ni-Al alloy in 3.5% NaCl aqueous solution And electrochemical corrosion rates were reduced to 0.022954754 and 0.26193 mm · a-1, respectively (5.3% and 8.45%, respectively); hardness, microstructure refinement and dislocation strengthening resulted in the friction of zirconium microalloyed as-cast nickel-aluminum bronze The coefficient is reduced to 0.022 (a decrease of 12.7%).