TAPPI TIP 0402-32:2010

These guidelines cover project and quality-related issues for
metal thermal spray coatings installed to prevent aqueous corrosion
in pulp mill process vessels, including digesters, flash tanks,
evaporators and concentrators. Thermal spray coatings protecting
recovery boiler tubes, restoring Yankee dryer surfaces,
hard-surfacing calendar rolls, and ceramic ("granite") coatings
used on paper machine rolls are not covered by this document,
although the basic, application guidelines and qualification
procedures described here apply in general to those applications as
well.

These guidelines describe properties thermal sprayed coatings
must have to perform adequately, listing items to include in
thermal spray job specifications. Coatings are generically
described, mostly according to the spray process. No guidance is
given either for choosing the coating process or the coating
material for specific service applications. Appendix A describes
the most common thermal spray processes.