Thank you!
Unfortunately, all black hardware (regardless of brand) is more prone to chipping vs. silver, gold or brass. There’s nothing you can really do to prevent it. And not all bags with black hardware will chip (you just never know). I have known people who have used black paint made for metal (can just be rustoleum), on chipped hardware. I’ve used it myself on silver hardware that I messed up when using pliers to remove a link (chain was twisted and it drove me nuts). As long as it’s allowed to dry properly it holds up very well.