Passivating alloys are
A thin surface oxide forms on chromium, which is a good example of a passivating metal. The most common example is stainless steel, which contains sufficient amounts of chromium added to iron and its alloys to passivate the alloy.
Titanium (Ti) also forms a passivating titanium oxide film, which is of interest, since both commercially pure Ti and alloys in which Ti is a major component are used for a variety of dental applications, such as cast restorations, orthodontic wires, endodontic instruments and implants.
Phillips 12th edition page 45
Cr, Al, Ti
Cr, Mo, Ti
Cr, Fe, Mo
Cr, Gold, Ti