A method for investigation of hot corrosion by gaseous Na2SO4
Journal article, 2013

A novel in situ exposure method for investigating hot corrosion of aluminde coatings in the absence of an alkali sulphate melt is presented. The samples are exposed to Na2SO4(g) at a temperature above the dew point of the gas. Results from 100 and 500 h exposures at 900 degrees C of Ni-based In792 covered with SIF232 aluminide coating are presented. Already after 100 h of testing, attack characteristic for Type I hot corrosion is observed. The reactions taking place during the testing are discussed and the results are compared with those from the well-known ex situ salt hot corrosion test.

XPS

Sulfidation

SEM

Superalloy

Hot corrosion

Author

Pavleta Knutsson

Chalmers, Chemical and Biological Engineering, Environmental Inorganic Chemistry

Haiping Lai

Chalmers, Applied Physics, Materials Microstructure

Krystyna Marta Stiller

Chalmers, Applied Physics, Materials Microstructure

Corrosion Science

0010-938X (ISSN)

Vol. 73 230-236

Subject Categories

Metallurgy and Metallic Materials

DOI

10.1016/j.corsci.2013.04.006

More information

Created

10/7/2017