How to repair the defects (shrinkage cavity and small air hole) of nodular cast iron? Almost no trace can be seen after the request for repair. Nickel plating on the surface after repair. Please give me some advice. 1. Adding a certain amount of ferrosilicon and magnesium in molten iron casting can make spheroidal graphite fine and evenly distributed in iron molecules, so that the basic pores of cast products are very small, even without pores.

2. If the cast iron after pouring has pores, fill the surface of the casting with a high-temperature metal caulking agent (the kind that can adhere to metal ions) and polish it smoothly, so that no traces can be seen on the surface after pickling and electroplating.

It might help you.