Steel is one of the most widely used construction materials with more than 1.3 billion tons produced each year. Buildings, industrial plants, machines, tools, pipelines, vessels and tanks are only a few of its applications in our daily life. Steel is an alloy made of iron and additional elements like carbon, chromium, manganese, vanadium and tungsten, and its quality, ductility, hardness and strength vary with the amount of the alloying element. As steels corrode in various atmospheres, in water and in soil its corrosion resistance against the four most common chemicals and inorganic acids – hydrochloric, nitric, sulfuric and phosphoric acid – as well as against mixed acids is essential and a crucial financial factor for many industries. These acids are present in nearly every industrial production process such as metal manufacturing but also explosives, food, dyes, leather, paper and fertilizers, to name only a few. Understanding how to strengthen the corrosion resistance of steels as reaction, transport and storage devices against these omnipresent and aggressive acids is key for all industries involved. This book is therefore a must–have for all mechanical, civil and chemical engineers, material scientists and chemists working with steel or acidic media.