在熔融碱金属硫酸盐中镍基高温合金的腐蚀

中国腐蚀与防护学报

1984, Vol. 4

Issue (2): 79-91

研究报告

本期目录 | 过刊浏览

在熔融碱金属硫酸盐中镍基高温合金的腐蚀

吴维(山文);A.Rahmel;M.Schorr

中国科学院金属腐蚀与防护研究所;DECHEMAInstitut;Frankfurt/Main;WestGermany;DECHEMAInstitut;Frankfurt/Main;WestGermany

CORROSION BEHAVIOR OF NICKEL-BASE SUPERALLOYS IN (Na, K)_2 SO_4 MELT

Wu Weitao(Institute of Corrosion and Protection of Metal; Academia Sinica) Rahmel; A.; Schorr; M.;(DECHEMA Institut; Frankfurt/Main; West Germany)

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摘要: 研究了在900℃的90Na_2SO_4-10K_2SO_4(克分子％)熔盐中,电极电位对镍基高温合金腐蚀行为的影响。在正电位条件下可发生酸性熔融(Acidic Fluxing),而在较负电位下则发生碱性熔融(Basic Fluxing)腐蚀。在中间(中性)电位区,含铬较高的合金如IN738,IN 939,IN597和IN657等可生成保护性氧化膜。合金成份将影响发生酸性和碱性熔融腐蚀的临界电位值。含铬低的合金如IN 100和IN 713LC在任何电位下均不能生成稳定的保护性氧化膜。鉴定了腐蚀产物层中的多种硫化物相,它们的生成与电极电位,腐蚀程度和合金的成份有关。只有在碱性熔融腐蚀条件下才能生成硫化物相NaCrS_2,它的出现可作为发生碱性熔融的标志。

Abstract：The influence of the electrode potential on the corrosion behavior of a series of nickel base superalloys has been studied in a 90(mol.%)Na_2SO_4-10 (mol.%) K_2SO_4 melt at 900 C. Acidic fluxing occurs at positive potentials and basic fluxing at negative potentials. A protective scale is formed in aa intermediate (neutral) potential range on high chromium containing alloys such as IN738LC, IN939, IN597 and IN657. The breakthrough potentials for acidic and basic fluxing are dependent on the composition of the alloys. Alloys with low chromium contents such as IN100 and IN713LC do not form stable protective scale at any potential. Numerous sulfide phases have been identified in the scales and subscales, depending on the potential. the severity of the attack and the materials composition. NaCrS_2 only forms under basic conditions. Its presence can therefore be considered as an indication that basic fluxing conditions have been existent.

收稿日期: 1984-04-25

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引用本文:

吴维(山文);A.Rahmel;M.Schorr. 在熔融碱金属硫酸盐中镍基高温合金的腐蚀[J]. 中国腐蚀与防护学报, 1984, 4(2): 79-91.
. CORROSION BEHAVIOR OF NICKEL-BASE SUPERALLOYS IN (Na, K)_2 SO_4 MELT. J Chin Soc Corr Pro, 1984, 4(2): 79-91.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1984/V4/I2/79

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