To clarify the corrosion behavior of Ni-based hard facing alloy Colmonoy 56 and the preferential dissolution detail at the micrometer scale,the microstructure and the elemental distribution of a rod were analyzed,foll...To clarify the corrosion behavior of Ni-based hard facing alloy Colmonoy 56 and the preferential dissolution detail at the micrometer scale,the microstructure and the elemental distribution of a rod were analyzed,followed with the polarization measurement in aqueous solution with different p H and Na Cl concentrations.This rod has Fe-,Si-,and Cr-solutioned[Ni]matrix with heterogeneously dispersed secondary phases of Cr_(23)C_(6),CrB,Cr_(2)B,and Cr_(5)B_(3).The polarization curve largely changed with different p H:active in acid solution and passive in neutral and alkaline solution.The strongest passivation appeared at p H=11.Cl^(-)promoted the corrosion attack to the[Ni]matrix.In the case of pH=11,Cl^(-)caused the fast climb of anodic current from passivation at a less noble potential.Preferential dissolution of the[Ni]matrix occurred in most solutions,except in the case of pH=14 without Na Cl,in which the secondary phases preferably dissolved.展开更多
china’s traditional manufacturing industries are facing a desperate situation after the government slashed import taxes on some consumer goods,including skincare products and western suits,by more than 50percent on a...china’s traditional manufacturing industries are facing a desperate situation after the government slashed import taxes on some consumer goods,including skincare products and western suits,by more than 50percent on average from June1.Ye tan,a financial commentator,believes it’s bound todeal a heavy blow to domestic manufacturers reliant on low- price strategies. Excerpts of her arguments follow：展开更多
文摘To clarify the corrosion behavior of Ni-based hard facing alloy Colmonoy 56 and the preferential dissolution detail at the micrometer scale,the microstructure and the elemental distribution of a rod were analyzed,followed with the polarization measurement in aqueous solution with different p H and Na Cl concentrations.This rod has Fe-,Si-,and Cr-solutioned[Ni]matrix with heterogeneously dispersed secondary phases of Cr_(23)C_(6),CrB,Cr_(2)B,and Cr_(5)B_(3).The polarization curve largely changed with different p H:active in acid solution and passive in neutral and alkaline solution.The strongest passivation appeared at p H=11.Cl^(-)promoted the corrosion attack to the[Ni]matrix.In the case of pH=11,Cl^(-)caused the fast climb of anodic current from passivation at a less noble potential.Preferential dissolution of the[Ni]matrix occurred in most solutions,except in the case of pH=14 without Na Cl,in which the secondary phases preferably dissolved.
文摘china’s traditional manufacturing industries are facing a desperate situation after the government slashed import taxes on some consumer goods,including skincare products and western suits,by more than 50percent on average from June1.Ye tan,a financial commentator,believes it’s bound todeal a heavy blow to domestic manufacturers reliant on low- price strategies. Excerpts of her arguments follow：
