Patent ID: 8656591

Claim:
A method of making an armature of a fuel injector for a fuel injection system of an internal combustion engine, the fuel injector including a solenoid coil, a restoring spring acting upon the armature in a closing direction and a valve needle, which is connected to the armature by force-locking and at which a valve-closure member is formed, which forms a sealing seat together with a valve-needle surface, the armature facing and striking against a stop face of an inner pole of the solenoid coil by way of an armature stop face, the method comprising: depositing a plurality of chromium layers onto a surface of the armature stop face, the deposition of the plurality of layers forming raised areas and recessed areas, the raised areas having a dome-shaped design, wherein the raised areas have a dome-shaped design and a height difference between the raised areas and recessed areas is initially between 5 μm and 10 μm and is reduced to between 4 μm and 5 μm during use of the fuel injector.