Extremely corrosion-resistant amorphous alloys in hot concentrated various acids, such as hydrochloric, nitric and phosphoric acids are reviewed. Amorphous alloys described are iron-, nickel-, copper- and aluminum-base alloys. The extremely high corrosion resistance is attained by alloying with valve metals, particularly with tantalum. Processing techniques of corrosion-resistant amorphous surface alloys on conventional crystalline metals by sputtering and by using laser and electron beams are briefly illustrated.
