Consider the galvanic series (shown below). From the choices provided below, ple
ID: 2088662 • Letter: C
Question
Consider the galvanic series (shown below). From the choices provided below, please select the three metals or alloys that may be used to galvanically protect brass. Your possible choices Cadmium, Copper, Silver, Titanium, Tin, Zinc Table 16.2 The Galvanic Series 316 Stainless steel (passive) 304 Stainless steel (passive) Inconel (SONi-13Cr-7Fe) (passive) Nickel (passive) Monel (70Ni-30Cu) Copper-nickel alloys Bronzes (Cu-Sn alloys) Increasingly inert (cathodie) Brasses (Cu-Zn alloys) Inconel (active Nickel (active) Increasingly active (anodic) 316 Stainlcss steel (active) 304 Stainless steel (active) Cast iron Iron and steel Aluminum alloys Cadmium Commercially pure aluminum um allovs Soerce: M. G Foatana, Corrosion Engineering. 3ed edition, Copyright 1986 by McGraw-Hill Book Company. Reprinted with permission. Table 16.2 o John Wiley & Son nc. ?? rights reserved.Explanation / Answer
The given series is galvanic series which gives the indication of relative reactivity of metals and alloys in seawater environment.The lower ranked metal or alloy tends to be more anodic and thus more reactive whereas the higher ranked one will be more cathodic or less reactive.Thus metal (alloys) ranked below brass can be preferntially be used for galvanically protecting brass. Also we have to take other factors into consideration to select a metal (alloys) such as cost of material used, durability, ease of machining, availability and toxicity. We can choose Lead, Stainless steel, Iron and Steel, Aluminium Alloys, Magnesium and its alloys for this purpose. these will act as anode and will corrode preferentially protecting Brass.