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Corrosion of steels in potable groundwater Part II – Experimental analysis
Author(s) -
Denier P.,
Cornet A.
Publication year - 1997
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19970480705
Subject(s) - corrosion , casing , diffraction , materials science , potable water , carbon steel , metallurgy , groundwater , environmental science , mechanical engineering , geology , physics , environmental engineering , engineering , geotechnical engineering , optics
We have found that some bacteria able to induce metallic corrosion were present in water cells used by heat pumps. After the appearence of different problems encountered on these installations, we have decided to study the behaviour of steels commonly used for casing. To reproduce short and long term corrosion, we have followed these materials during 18 months with different analyses at 3, 8 weeks and at 12 and 18 months. The two stainless steels (AISI 3041, and 430) have similar behaviour. On the other hand, the low carbon steel (NF F‐24) and the low alloyed steel (APS20A) present important similarities. DC and AC analysis show that E24 and APS20A have a complex behaviour. But both can be simulated by elementary electrical analogues as a one time constant circuit in the early stage and by a two nested time constant circuit after 18 months with a diffusional process (Warburg). SEM observations and X‐ray diffraction spectra have given important informations on the chemistry and the geometry of the surface (bacteria, crystals…).