1. You are designing an underwater robot to search for sunken treasure in the oc
ID: 1046954 • Letter: 1
Question
1. You are designing an underwater robot to search for sunken treasure in the ocean. You are considering the following alloys to use for the rivets and plates. For each alloy pair, answer the following questions using the information from Table 17.2 (Lecture 19, Callister 17.2): (i) Will corrosion happen? Why? (ii) If corrosion does happen, which material should be the rivet and why? Table 17.2 The Galvanic Series Platinum Gold Graphite Titanium Silver 316 Stainless steel (passive) 304 Stainless steel (passive) Inconel (80Ni-13Cr-7Fe) (passive) Nickel (passive) Monel (70Ni-30Cu) Copper-nickel alloys Bronzes (Cu-Sn alloys) Copper Brasses (Cu-Zn alloys Inconel (active) Nickel (active Tin Lead 316 Stainless steel (active) 304 Stainless steel (active) Cast iron Iron and steel Aluminum alloys Cadmium Commercially pure aluminum Zinc Magnesium and magnesium alloys Increasingly inert (cathodic) Increasingly active (anodic) (a) Aluminum alloy and magnesium alloy (b) Zinc alloy and low-carbon steel (c) Brass (60 wt% Cu-40wt% Zn) and Monel (70 wt% Ni-30 wt% Cu) (d) Titanium alloy and stainless steel 304 alloy (active) (e) Cast iron and stainless steel 316 alloy (passive)Explanation / Answer
(a)
Corrosion will happen because they are occupying bottom positions in galvanic series.
Aluminium alloy - less corrosion - plates,
Magnesium alloys - high corrosion - rivets, reason is already given above.
(b)
Zinc - high corrosion - rivets,
low carbon steel - less corrosion - plate , reason is already given above.
(c)
Brass - high corrosion - rivets ,
Monel - less corrosion - plate, reason is already given above.
(d)
Corrosion won't happen in case of titanium alloy because it is occupying top positions in galvanic series,
so
Titanium alloys - very less corrosion - plates, stainless steel 304 alloy (active) - high corrosion - rivets
(e)
In case of Cast iron corrosion will happen but in case of stainless steel 316 alloy (passive) it won't happen so
Cast iron - high corrosion - rivets, and stainless steel 316 alloy (passive) - very less corrosion - plates
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