Hot corrosion behavior and near-surface microstructure of a "low-temperature high-activity Cr-aluminide" coating on inconel 738LC exposed to Na2SO4, Na2SO4 + V2O5 and Na2SO4 + V2O5 + NaCl at 900 °C

被引：38

作者：

Doolabi, M. Salehi ^{[1
]}

Ghasemi, B. ^{[1
]}

Sadrnezhaad, S. K. ^{[2
]}

Habibollahzadeh, A. ^{[1
]}

Jafarzadeh, K. ^{[3
]}

机构：

[1] Semnan Univ, Fac Mat Sci & Engn, POB 35131-19111, Semnan, Iran

[2] Sharif Univ Technol, Dept Mat Sci & Engn, Azadi Ave,POB 11365-9466, Tehran, Iran

[3] Maleke Ashtar Univ Technol, Mat Dept, Tehran, Iran

来源：

CORROSION SCIENCE | 2017年 / 128卷

关键词：

Metal coating; Superalloys; Molten salts; Hot corrosion; CYCLIC OXIDATION BEHAVIOR; NI-BASED SUPERALLOY; BASE SUPERALLOY; NICKEL; ALLOYS; ENVIRONMENT;

D O I：

10.1016/j.corsci.2017.09.004

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Hot corrosion is a serious problem in gas turbines due to poor quality fuels which contain Na, V, S and Cl. To resolve the problem, Cr-aluminide was coated on IN-738LC superalloy with a two steps pack cementation process. Oxidation behavior and near-surface microstructure of the coating showed consecutive increase in destruction by exposition to Na2SO4, 75Na(2)SO(4) + 25 V2O5 and 70Na(2)SO(4) + 25 V2O5 + 5NaCl (wt.%). Kinetic studies indicated parabolic corrosion rate in salt-less samples due to diffusion. Similar expression for salt-covered samples was assessed for oxide dissolution. Plate-like, broken-plate-like and cauliflower-like morphologies attributed to the corrosion products were observed after exposition to above three salts, respectively.

引用

页码：42 / 53

页数：12

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