Coating adhesion shall be evaluated t hrough the following test :- bend test as per ISO 6158. Bending a coated specimen (stripspar. 3.9) atabout 180° with a cylinder with diameterequal to 4 /6 times the specimenthickness, but not less than 10 mm. The coating shall n ot show anyspall ation or detachment . Cracks parallel to bending axis a reallowed.- Grind test according to ASTM B571 (on cylinder specimen par. 3 .9 and oncoated items), applicable in case of shaft /rotor bearing necks plating. Macroobservation after g rinding operation shall not reveal any spallation,detachment or cracks.