High-temperature corrosion protection

Diffusion alurninide and sihcide coatings on external and internal surfaces for high temperature corrosion protection in parts such as gas-turbine blades is estimated at 40 x 10 /yr in North America and about 50 x 10 worldwide. 

The development of CVD films for high-temperature corrosion protection of ferrous alloy has focused on methods with and without addition of oxygen-active elements. CVD processes, which employ vapor-transport and heat treatment of a stabilized alloy substrate to... 

A durable protective coating for high-temperature alloys can be achieved by CVD. Normally, we must consider alloy stabilization in addition to chemical reaction in a controlled environment. The results define the nature of coatings for high-temperature corrosion protection, namely, a thin (1-2 pm) diffused silicon layer that covers the surface and penetrates even the smallest defects, cracks, etc., on the alloy to be protected. This surface modification treatment by CVD can be adapted to other alloys and is technologically simple and relatively inexpensive. 

F.J. Perez, E. Otero, M.P. Hierro, C. Gomez, F. de Pedtaza, J.L. Segovia, E. Roman, High temperature corrosion protection of austenitic AISI304 stainless steel by Si, Mo and Ce ion implantation. Surf. Coat. Tech. 108-109 (1998) 127-131. 

The types of high temperature corrosion mentioned so far will be discussed in more detail in later sections. Before doing so, however, fire next section will deal with the aspect of high temperature corrosion protection and the fundamentals of oxide scale growth. The reason for this is that the key... 

V. Rohr, A. Donchev, M. Schiltze, A. Milewska, F.J. Perez, Diffusion coatings for the high temperature corrosion protection of 9-12% Cr steels, Proc of the EUROCORR Conference in Nice (CD) EFC event no 266, paper no 237 (2004). 

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