The passivation technology and related parameters based on phosphomolybdie heteropolyacid were determined making use of neutral salt spraying test, damp-hot test, and saline water immersi.

Test study on passivation methods in chemical cleaning of boilers, including to use sodium nitrite, hydrogen peroxide, polyphosphate, hydrazine, acetone oxime, trisodium phosphate, and sodium carbonate, has been carried out, and combined with typical examples of application, recommendations for selecting these passivation methods and for using suitable passivation technology being put forwad.