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Class 2 (2nd Engineer) MEKG 📅 Oct 2022

Exam Question

(a) Describe the properties of each of the following alloys used in marine engineering, giving a practical example for which, each is suited:

(i) Cupro-nickel

(ii) White metal

(iii) Titanium.

(b) Discuss the merits of EACH of the following alloys for use in the casting of large propellers:

(i) Nickel aluminium bronze

(ii) Stainless steel.

(c) Describe the tests that may be carried out on steel to be used for ship's side plating.

Reference Answer

### (a) Properties and Applications of Marine Alloys
#### (i) Cupro-nickel (Cu-Ni)
* **Properties:**
* **Corrosion/Erosion Resistance:** Exhibits outstanding resistance to corrosion and erosion in high-velocity seawater environments. A thin, adherent, and self-healing surface film forms, protecting the underlying metal.

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