Mẫu chuẩn Nickel (Ni) cho máy đo chiều dày lớp mạ XRF, XRD
Nickel coatings shall be classified in accordance with thermal treatment applied subsequent to plating:
Class 1: As plated, no subsequent heat treatment: a bake for hydrogen embrittlement relief is not considered a heat treatment.
Class 2: Heat treated to obtain required hardness. May be used on all metals not affected by heating to 500F and above. Coatings shall have a minimum hardness of 800 knoop or equivalent vickers when tested. Class 2 coatings on steel parts that have a hardness of 40 RCH or above are required to be tested without cracking of fracture. The desired hardness can be achieved by heating the part (see within 4 hours arter coating).
Class 3: Aluminum alloys non heat-treatable, and beryllium alloys processed to improve adhesion of the nickel deposit. Non heat-treatable aluminum parts shall be heated for 1 to 1.5 hours at 375F to improve adhesion of nickel deposit.
Class 4: Aluminum alloys, heat-treatable, processed to improve adhesion of the nickel deposit. Heat-treatable aluminum alloys shall be heated between 240F to 260F for 1 to 1.5 hours to improve adhesion of nickel deposit.