If you can take a picture & post that would be helpful.
The coloration, relief and pattern help a lot for the corrosion type.
Honestly, at the 2-year point, the pipe should be way past the "least-soluable & most protective oxide layer" stage and you shouldn't have any type of bright orange (ferritic) corrosion unless there is an enviromental contaminant, or some physical/mechanical stress has breached the top/outside layer of oxidation to expose the bare metal underneath.
Normal Oxidation (a.k.a. "coloring)" is typically a single & uniform coat that is dark brown/black .... so if you have delamination, blistering, crevices/pits or a bright orange/red coloration, or the site is raised/flaking, you definately need to check out whats going on.
Definately don't want to cover/mask a accelerated ferritic corrosion with paint/tape/etc without figuring out what caused it.