Summary for black oxide rust prevention Discussion
Black oxide rust prevention is the core issue in this thread: the questioner says black oxide coated screws used in painted steel assemblies eventually rust, including the screws and tapped holes, and asks how to prevent it or at least extend rust-free life. The excerpt provided does not include any replies, so no specific remedy or named expert advice is available in the source shown. The only concrete context is that the fasteners are black oxide coated and the user is interested in improving MIL-DTL-13924 performance. Because no answers are present, the page as excerpted mainly establishes the corrosion problem rather than resolving it. A fuller thread would be needed to summarize recommended coatings, sealants, installation practices, or material changes.
Q. Hello!
In some applications, I am using as fasteners black oxide coated screws. When I am using these fasteners to assemble steel painted elements, after a period of time, the screws and the taped holes of the steel parts will develop rust. How can I prevent this to happen, or, at least, increase the life, “rust free” of my assemblies? I am interested to improve MIL-DTL-13924
[⇦ this spec on DLA] of the hardware and (or) to do a local treatment of the taped holes of my steel parts. What do you recommend?
Thank you in advance,
Octav Nour
– Beverly, Massachusetts
A. Hi Octav. Look into zinc-iron plating followed by black chromating of the screws. This will definitely protect the screws much longer and, with luck, will also protect the tapped holes. Good luck.
Ted Mooney, P.E.
Striving to live Aloha
finishing.com – Pine Beach, New Jersey
Need quick confidential answers? $25
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Ted,
Thank you for the advice.
Regards,
Octav Nour
– Beverly, Massachusetts