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Effect of Ti, Mo and Al Addition on the Sulfidation Behavior of an Ni 20Cr 13.5Co Alloy

机译:钛,钼和铝的添加对Ni 20Cr 13.5Co合金硫化行为的影响

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Effect of Ti, Mo and/or Al addition on the sulfidation behavior of an Ni-20Cr-13. SCo alloy was investigated in H_2-H_2S mixtures with sulfur partial pressures of 10~(-7), 10~(-5.5) and 10~(-4) Pa at 873 K. A four-layers scale was formed on the surface of the alloys at the sulfur partial pressure of 10~(-4) Pa, while at the 10~(-5.5) Pa-sulfur pressure a triplex scale was formed. The sulfidation resistance of the Ni-20Cr-13.5Co alloy was improved by adding of Mo or Al, especially Al, in those atmospheres. Outer sulfidation layer of Cr_3S_4, thin inner sulfidation layer and internal sulfidation were observed at the sulfur partial pressure of 10 7 Pa. As the atomic ratio of Al to Ti in the alloy was larger than 1 on the alloys added Ti, Mo and Al all together, the thickness of the internal sulfidation layer greatly got thinner in this atmosphere.
机译:钛,钼和/或铝的添加对Ni-20Cr-13硫化行为的影响。在873 K的硫分压为10〜(-7),10〜(-5.5)和10〜(-4)Pa的H_2-H_2S混合物中研究了SCo合金。在表面形成了四层氧化皮。合金的硫分压为10〜(-4)Pa,而硫分压为10〜(-5.5)Pa时,形成了三层氧化皮。通过在这些气氛中添加Mo或Al,尤其是Al,可以提高Ni-20Cr-13.5Co合金的抗硫化性能。在硫分压为10 7 Pa的条件下,观察到了Cr_3S_4的外硫化层,薄的内硫化层和内硫化。由于在添加Ti,Mo和Al的合金中,合金中Al与Ti的原子比大于1。在一起,内部硫化层的厚度在这种气氛下大大变薄。

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