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以高活性聚异丁烯(PIB)和苯酚(C6H50H)为原料,三氟化硼乙醚-三氧化二铝(BF3 ·C4H10O-Al2O3)为复合催化剂合成了对聚异丁烯苯酚。并通过傅立叶变换红外光谱(FT-IR)和超导核磁共振光谱(NMR)对合成的对聚异丁烯苯酚进行了研究,结果表明此法合成的对聚异丁烯苯酚具有很高的选择性,产物中不含其它异构体。采用差示扫描热分析(DSC)对合成的对聚异丁烯苯酚的进行分析,结果表明对聚异丁烯苯酚与高活性聚异丁烯相比,具有较高的热稳定性。 相似文献
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Galvanic corrosion behavior of Ti-1023 titanium alloy coupled 30CrMnSiA steel was investigated in 3.5% NaCl solution. Particular attention was given to the effect of three different electroplated coatings on corrosion behavior of the galvanic couple. Galvanic corrosion test was conducted on Ti-1023 titanium alloy which coupled Ni-electroplated 30CrMnSiA, Zn-electroplated 30CrMnSiA, Cd-electroplated 30CrMnSiA and bare 30CrMnSiA, respectively. Corrosion properties including open circuit potential (Eoc), galvanic corrosion potential (Eg), and galvanic corrosion current (lg) were monitored. Corrosion morphology was observed by optical microscope (OM) and corrosion mechanism was analyzed and discussed. The results show that the three electroplated coatings improve the corrosion resistance of the anode in different magnitudes. Ni-electroplated 30CrMnSiA and Cd-electroplated 30CrMnSiA coatings are found to be least susceptible to galvanic corrosion when coupled Ti-1023 titanium alloy. Zn-electroplated 30CrMnSiA is moderately susceptible to galvanic corrosion. But the bare 30CrMnSiA is highly susceptible to galvanic corrosion in corrosive environment. 相似文献
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在含食品添加剂植酸钠的碱性溶液中,研究了甘油磷酸钙浓度对Mg-0.5Ca合金微弧氧化过程和微弧氧化膜性能影响。结果表明,随着甘油磷酸钙浓度增加,溶液电导率增加,氧化终电压减小。甘油磷酸钙能增加涂层厚度,增大微孔直径,并能提高微弧氧化膜的耐蚀性。EDS分析表明,加入甘油磷酸钙后,微弧氧化膜中磷含量增加,表明甘油磷酸钙参与了氧化膜的形成过程。当甘油磷酸钙浓度为15 g/L时,氧化样品的耐蚀性最好。 相似文献
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NiTiNb形状记忆合金管接头的耐蚀性能 总被引:1,自引:0,他引:1
采用模拟环境腐蚀实验、电化学腐蚀实验,结合SEM等手段,研究了内脊型NiTiNb形状记忆合金(SMA)管接头在典型环境中的安全性和耐蚀性能.结果表明,在外加应力、腐蚀介质、航空油压以及高温烘烤等模拟环境因素的作用下,NiTiNb合金管接头系统能安全可靠的工作,合金表面完整连续,耐蚀性能优良.电化学腐蚀测试表明该合金在NaCl溶液中具有良好的耐蚀性能,90℃时点蚀电位约为240mV,腐蚀电流密度只有约30μA/cm^2.随着NaCl溶液温度的降低,合金的腐蚀电流密度变小.腐蚀电位正移,合金的耐蚀性提高.NiTiNb合金在NaCl溶液中的电化学阻抗谱(EIS)由单一的容抗弧构成,这与表面生成了一层与基体紧密结合的致密TiO2保护膜有关,它对提高合金在溶液中的耐蚀性能有利. 相似文献
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