Spraying material

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PROBLEM TO BE SOLVED : or hydrochloric acid corrosion by spraying a spraying material capable of forming a film. SOLUTION : the spraying material of the present invention, rare earth elements, and rare earth elements aluminumoxy fluoride (LnOF) of fluoride (LnF 3) degranulation contg.. The sprayed material 50g of putting a 40 ±5 °C while stirring the hydrocloride of 500 ml 3mol/L 40 ±5 °C for 2 hours after maintaining the liquid obtained by solid-liquid separation in the concentration of the rare earth elements and the C (unit mol/L), a BET specific surface area of the spraying material S (unit m 2/g) and when, C/S (unit mol·g / (m 2 ·L)) value of 0. 04 or less. The angle of repose of the spraying material is preferably less than 40°. The difference angle of 10° or less suitable spraying material. Selected drawing : no