MIL-STD-1501F
stripped in accordance with MIL-STD-871.
4.8 Plating thickness. The plating thickness shall be as specified on the engineering drawing or other applicable directives. Except when otherwise specified, the minimum thickness shall be 0.05 millimeters (0.002 inches) and the maximum thickness 0.2 millimeters (0.008 inches) on the finished part.
4.9 Class 1. Parts plated to Class 1 shall show no mud cracking pattern when fluorescent penetrant inspected (see para.5.3.1).
4.10 Class 2. Parts plated to Class 2 are allowed to show some cracking pattern when fluorescent penetrant inspected (see para.5.3.1). As a general rule cracks exceeding 13 millimeters (1/2 inch) in length or individual areas of cracking exceeding 19 square centimeters (3 square inches) or 10 percent of plated area, whichever is smaller, will be cause for rejection of the plated area.
4.11 Class 3. Parts plated to Class 3 are allowed to show a moderate amount of cracking when fluorescent penetrant inspected (see para.5.3.1). To determine part acceptability the part will be cleaned to remove the penetrant materials and the areas of cracking inspected visually using an oblique light. If the cracking pattern can be discerned, that will be cause for rejection of the plated area.
4.12 Type I plating. For Type I plating, the item shall be plated to the dimension and surface finish specified on the drawing. The surface finish on the item before plating shall be equal to or better than the required finish after plating. Type I plating may be buffed or lapped after plating if dimensional tolerances and surface conditions cannot be controlled in the plating operation.
4.13 Type II plating. For Type II plating a minimum of 0.05 millimeters (0.002 inch) more chrome than desired shall be deposited (per surface). The excess shall be ground off to give the final dimension and surface finish desired. Steel parts heat treated to 1.24 X 109 Pa (180,000 psi) and above shall be ground in accordance with MIL-STD-
866. All ground chrome plated surfaces shall be fluorescent penetrant inspected (see
5.3.1). Chrome plated surfaces showing indications of abusive grinding (spiral, barber pole, circular, patch or linear crack patterns), spalling or blistering shall be cause for rejection of the plated area.
5. DETAILED REQUIREMENTS
5.1 Individual tasks, requirements, or test methods.
5.1.1 Prior to plating. Except for finish grinding operations, all machining, forming, welding and shot peening shall be completed prior to plating.
5.1.2 Baking. Parts shall be baked for stress relief before plating for four hours minimum at 191 ± 14°C (375 ± 25°F). Shot peening shall be performed before plating
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