Many years of experience shows that biological corrosion occurs on the inner surface of mineral oil tanks, fuel tanks. Condense water allows bacteria and fungi to grow at the steam/liquid interface, and so called sulphate reducing bacteria (anaerobic strain) appear in the liquid (water/oil).
Factors influencing their growth:
air, water, temperature, pH, osmotic pressure, etc. E.g. in diesel fuels.
| bacteria | fungi | |
| Pseudomonas sp. | Hormoconis resinae | |
| Flavobacterium sp. | Fusarium sp. | |
| Sarcina sp. | Candida sp. | |
| Desulfovibrio sp | Aspergillus sp. | |
| Desulfotomaculum sp. | ||
| Hydrogenomonas sp. | ||
| Clostridium species |
The solution to the problem is to regularly add a suitable biocide in an appropriate quantity – primarily the isothiazolinone or formaldehyde donor active ingredients are effective.
Isothiazolinone-mixture based
| Name | type/solvent | effective in the aqueous phase | effective in the organic phase |
| ACTICIDE CMG | glycol based | no | yes |
| ACTICIDEMV | aqueous | yes | no |
Formaldehyde donor containing
| Name | type/solvent | effective in the aqueous phase | effective in the organic phase |
| ACTICIDEOX | Oxazolidine | in part | yes |
| ACTICIDE F(N) | HMU (ureide) | in part | no |
| ACTICIDE TKP 75 | THPS | in part | no |
The biocides most frequently used for this purpose are Acticide CMG and Acticide OX.