Progress of corrosion-resistant coatings for waterwall tubes

6 Progress of corrosion-resistant coatings for waterwall tubes [Pg.572]

The metal temperatures of the waterwall tubes (WWTs) are relatively low, approximately 230-330 C, depending on the steam pressure (2.9-9.8 MPa). Here CRCs such as metal spray coatings, weld overlays, or claddings with high CRMs on the outer surface are applied onto the base material of carbon steel as shown in Fig. 19.12. Table 19.3 shows examples of the application of various CRCs to WTE boilers. [Pg.572]

Metal spray coating of CRMs with a thickness of 150-500 pm can be applied on site quickly at low cost. The actual application of Al/80Ni20Cr alloy [Pg.572]

Coating process Chemical composition (materials) Applied condition (°C) Durability (years) Reference [Pg.575]

Plasma Plasma/fused 15Cr-Si, B, Fe-75Ni base WW 230 700-800 4 27 [Pg.575]

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