耐熱合金の高温硫化腐食挙動

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Hot corrosion behavior of various commercial heat resisting alloys was investigated at 800 and 900℃ by means of furnace test using synthetic ash mixture composed of 90%Na_2SO_4 plus 10%NaCl. Ranking of alloys for corrosion resistance evaluated by furnace tests generally coincided with that of the corresponding alloys in combustion rig tests carried out by other researchers. Furnace tests showed that nickel-base alloys containing about 20% Cr exhibited most superior resistance to corrosion and nickel-iron-base, cobalt-base, iron-base and lower Cr bearing nickel-base alloys were more corroded in this order. Hot corrosion caused readily intergranular penetration in most of these alloys. The very poor corrosion resistance of low Cr-nickel-base alloys were responsible for the severe intergranular penetration as well as surface attack. It was also found that Cr, Co and Fe had beneficial effect on the corrosion resistance of nickel-base alloys, while the detrimental effect of Mo was less pronounced. As regards the effect of Ni, there existed an optimum content of about 40 to 50%. In Inconel 751 alloys subjected to hot corrosion, the intergranular penetration progressed in a parabolic rate law and the temperature dependence of the parabolic rate constant changed at about 780℃. An extremely low activation energy at the range above this transition temperature suggested that some liquidous corrosion products such as Ni_3S_2-Ni eutectic took part in the hot corrosion process.
社団法人日本鉄鋼協会の論文
1981-05-01

耐熱合金の高温硫化腐食挙動

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