Summary for black oxide scratch repair Discussion
black-oxide scratch repair is the core issue here: A Woo of Livonia, Michigan asked whether scratches on MIL-C-13924 Class 1 black oxide must always be reworked by stripping and re-black-oxidizing the part, or whether minor scuffs could be touched up with gun blue and still comply. The thread excerpt provided does not include any replies, so no acceptance standard or definitive repair method is stated in the source. The question itself highlights two practical concerns: visible bare metal on scratches ranging from about .030" to .200", and the time cost of sending affected components out for hot black oxide rework. Because no answer text is shown, the page can only be summarized as an open question about whether the specification allows visual acceptance criteria or localized touch-up for minor damage.
January 10, 2022
Q. Hi all, I work in a ballscrew manufacturing plant. We recently have had a customer constantly sending back parts for scratches that range from a light scuff (~.030″) to a more apparent scratch (~.200″) on the black-oxide finish per milc13924 with a claim that bare metal is showing and it needs to be fixed. In order to meet the spec best to our knowledge we have been disassembling the part and sending out the affected component for hot black-oxide (Class 1). This is a timely rework process and I was wondering if there is an acceptance/visual standard for scratches on black-oxide or if we can use a gun blue on minor scratches and still meet the spec Class 1.
A Woo
– Livonia, Michigan