APP0414NI – Alloy selection for service in organic acids

This technical guide offers an overview of the corrosion behavior of organic acids and provides guidance on selecting suitable stainless steels and nickel-containing alloys for their production, handling, and storage. It examines how variables such as temperature, pH, contaminants, and redox conditions influence corrosion performance in systems involving formic, acetic, propionic, butyric, fatty, and naphthenic acids. The document also outlines recommended alloys for different operational environments and highlights key considerations for preventing intergranular corrosion, pitting, crevice corrosion, and chloride stress-corrosion cracking.