post a photo of your oxidation.
Is it oxidation or is it rust?
If its rust go buy a orange or grapefruit cut it in half and with a old tooth brush use the juice from the fruit to scrub the rust away. Then apply a good coat of wax.
You can not power coat or paint your fork tubes it will not stick and it will wear off as your front end works.
Please add your state and model of bike you have. Click user CP @ top of page and then far left click edit signature. Thanks