API 571 Certification (Corrosion & Materials) Practice Test

Which material has improved resistance to brine corrosion?

1. Copper alloys

2. Carbon steels

3. Ni-Cr-Mo alloys

4. Lead alloys

The correct answer is: Ni-Cr-Mo alloys

The choice of Ni-Cr-Mo alloys reflects a material that has enhanced resistance to brine corrosion due to its specific composition and microstructural properties. Nickel, chromium, and molybdenum all contribute to the corrosion resistance of the alloy. Nickel increases toughness and resistance to pitting, while chromium enhances oxidation resistance and overall corrosion resistance. Molybdenum is particularly effective in preventing localized corrosion, such as pitting and crevice corrosion, which are common concerns in brine environments where chloride ions are present. Brine, which is a high concentration of salt solution, can cause significant corrosion risks to many materials. However, Ni-Cr-Mo alloys are specifically designed to withstand such aggressive environments, making them a suitable choice for applications exposed to brine. Their resilience is essential in industries such as marine environments, oil and gas production, and chemical processing, where brine is prevalent. In contrast, other materials like copper alloys, carbon steels, and lead alloys do not offer the same level of resistance to brine corrosion. Copper alloys may perform adequately in certain situations but can suffer from corrosion in saline environments. Carbon steels are generally prone to corrosion without appropriate protective measures, especially in chloride-rich environments. Lead alloys can have