🔍 Key Concepts

• Galvanic series in seawater and which metals are more noble (resistant) vs more active (sacrificial) • Typical hull and fitting materials used on ships for long-term seawater exposure • Role of sacrificial anodes (what metals are chosen to corrode first) vs metals chosen to resist corrosion

💭 Think About

• Think about which of these metals is commonly used as a sacrificial anode on ships and piers – that one is meant to corrode, not resist corrosion. • Consider which metals are normally used for structural strength (like hulls) vs which are used where high corrosion resistance in seawater is essential. • Ask yourself which of these metals is considered more noble (less likely to corrode) in the galvanic series when immersed in seawater.

✅ Before You Answer

• Identify which choice is typically used as a sacrificial anode in seawater systems – eliminate that for “best resistance.” • Recall which materials are prone to rusting or rapid pitting in seawater without special coatings – those will not be top performers. • Think about which metal is often alloyed or plated onto others to improve their corrosion resistance in marine environments.