Liquid Metal Corrosion of 316L, Fe3AI, and FeCrSi in Molten Zn-AI Baths

Corrosion tests of 316L and two intermetallic compounds Fe3AI and FeCrSi in industrial Galvanizing (Zn-0.18Al), GALFAN (Zn-5AI), GALVALUME (Zn-55AI), and Aluminizing (AI-8Si) baths and lab-scale static baths were conducted. In on-line tests in industrial hot-dip baths, 316L steel shows better corrosion resistance than Fe3AI in Galvanizing, GALFAN, and GALVALUME baths. The corrosion resistance of 316L and Fe3AI is similar in Aluminizing bath. In static tests, FeCrSi shows the' best corrosion resistance in pure Zn, Zn-55AI~ and AI-8Si baths. The corrosion resistance of 316L is better than that of Fe3Al. In Zn-5AI bath, 316L shows no thickness loss after the test. For the same bath composition, the corrosion rates of the alloys in industrial baths are higher than those in static baths. Bath temperature and chemical composition play important roles in corrosion and intermetallic layer formation. Increasing bath temperature accelerates the corrosion process and changes the nature of intermetallic layers. A small amount of aluminum reduces the corrosion process by reducing the activity of Zn and forming inhibition layer. However, after aluminum content reaches the critical point, the dominant corrosion process changes from Zn-Fe reaction to AI-Fe reaction, and, consequently, the corrosion process accelerates by increasing aluminum content in the bath.