The issue with brines and marinades is to use a "non-reactive" pot or vessel. Glass, plastic, clay, enamel, and the better stainless steel pots are best for brines and marinades. I use everything but clay.
Reactive vessels like aluminum, copper, cast iron, and carbon steel are great for cooking (heat transfer) but allow chemical reactions between the salts in brines and the acids in marinades during longer exposures, corroding the vessel and giving metal taste to the food.