Abstract
The corrosion behaviour of stainless steels in wet process phosphoric acid was studied by means of polarization curves and corrosion tests; in this context the influence of impurities that enhance the corrosivity of the acid, such as chlorides, fluorides and sulphates, was evaluated. Moreover the efficiency of some corrosion inhibitors, present as impurities in wet-process phosphoric acid, was evaluated by means of polarization curves and corrosion tests. Inhibitors of fluoride aggressiveness such as compounds of silicon, aluminum, magnesium were tested both separately and together. Trivalent iron as an oxidizing agent was also evaluated in order to minimize chloride-induced corrosion. Different grades of stainless steels such as AISI 316 L, Alloy 20, Alloy 28 and a duplex stainless steel 22Cr5Ni type, were taken into consideration.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Alon A, Yahalom J and Schorr M (1975) Influence of halides on the corrosion behavior of stainless steels. Corrosion 31: 315–39
Sydberger T and Nordin S (1978) Corrosivity of wetprocess phosphoric acid Corrosion 34: 16–22
Wallen B and Andersson I (1980) Transport of wetprocess phosphoric acid. Corrosion studies and experiences. Avesta Stainless Bulletin 47: 6–18
Schmidtmann E and Hesse HD (1981) Dependence of the corrosion behaviour of stainless steels in phosphoric acid on the chloride and fluoride contents and heat-treatment during welding. Werkstoffe Korrosion 32: 521–527
Umemura F and Kawamoto T (1982) Corrosion of stainless steel in crude phosphoric acid. Boshoku Gijutsu 31: 275–280
Nassif N (1985) Influence of impurities in phosphoric acid on the corrosion resistance of some commercially produced alloys. Surface technology 26: 189–198
Honda M, Kobayashi Y and Kitada T (1986) Corrosion behaviour of stainless steels in wet process phosphoric acid. UK Corrosion '86, The Institute of Corrosion Science and Technology, Birmingham, UK
Kitada T, Honda M, Kobayashi K, Takamoto T and Kaneko Y (1987) Corrosion resistance of stainless steels for chemical tanker service Nippon Kokan Tech Rep 50: 35–42
Sillen LG and Martell AE (1964) Stability Constants of Metal-Ion Complexes. The Chemical Society, London, UK
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Barraco, P., Chiaro, G. & Barbera, A. Influence of impurities on stainless steels corrosion in wet process phosphoric acid. Fertilizer Research 26, 281–289 (1990). https://doi.org/10.1007/BF01048766
Issue Date:
DOI: https://doi.org/10.1007/BF01048766