A single NEXPLANON implant is inserted subdermally in the upper arm. To reduce the risk of neural or vascular injury, the implant should be inserted at the inner side of the non-dominant upper arm about 8-10 cm (3-4 inches) above the medial epicondyle of the humerus.
Graphitic corrosion is selective leaching of iron from gray cast iron, where iron particles are removed and graphite grains remain intact. Graphitic corrosion is also known as selective leaching, dealloying, demetalification, parting and selective corrosion.
I have come across numerous cases of galvanic corrosion between zinc plated carbon steel fasteners and aluminum panels. In this case the aluminum is the anode and the carbon steel is the cathode. The surprising thing is that very often the steel fasteners have a great deal of red rust and the aluminum is fine. From what I understand of galvanic corrosion, I would have expected very little corrosion to either material.