The influence of platinum on the oxidation and sodium sulfate induced hot corrosion of NiAl diffusion coatings
Artikel i vetenskaplig tidskrift, 2011

Oxidation and corrosion properties at 900 degrees C of two coatings, one containing platinum and the other platinum-free, on IN792 were investigated. During the corrosion exposures, sodium sulfate salt was situated in the furnace together with the coated specimens. The temperature of the salt was kept above its melting point but lower than the temperature of the coating i.e. 900 degrees C. The exposure times ranged from 100 to 1000 h. The formed oxide scales were studied by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electron microscopy and scanning transmission electron microscopy techniques. It is shown that the presence of Pt improves the protective properties of the coating against corrosion. The propagation stage of corrosion on the platinum-free coating is reached already after 100 h of exposure. On the other hand the scale formed on the platinum-rich samples still appeared to be protective even after 500 h. The details concerning structure and chemistry of the scales formed are presented and discussed.

surface & coatings technology

tlock gj

growth

diffusion coatings

superalloy

1990

wancy hm

v41

oxide scale

p1

p710

sodium sulfate corrosion

adhesion

2011

1991

werkstoffe und korrosion-materials and corrosion

microstructure

alloys

modified aluminide coatings

p1

resistance

odeshmukh v

behavior

influence of platinum

v49

oxid met

Författare

Haiping Lai

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Pavleta Knutsson

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Krystyna Marta Stiller

Chalmers, Teknisk fysik, Mikroskopi och mikroanalys

Materials at High Temperatures

0960-3409 (ISSN)

Vol. 28 4 302-308

Ämneskategorier

Materialteknik

DOI

10.3184/096034011X13188762374132