Bevel-helical gear box B2 Type H H Mass moments of inert B2HV-4-C

Flender/Flender Gear Units/Bevel-helical gear box B2

mulsions, because the CI may in principle be initially water or oil-soluble for incorporation, but it may also be only moderately soluble in water and in oil The influence of the solubilit properties of CI and emulsifier on the resultant rust-inhibiting ef- - ~ ficiency is to be investigateJ -~ 2.4 Emulsion stability For good handlin under practical conditions, rust-inhibiting emulsions must remain stable for as long as possibqe However, it must be expected that the degree of emulsion stability in- fluences the rust-inhibitin effect In order to quantify this influence, the stability of the emul- sion must be determinedgexactly To avoid tedious tests, Prof Schon' workin group (GH, Essen) is attempting to determine the stability (or the start of destabilisation) ? oil-in-water emulsions after short stora period using dielectric spectroscopy, and thus to draw conclu- sions as to the long-term bexaviour 3. Results Wetting tension measurements according to the Wilhemy method showed that oleophilic polar corrosion inhibitors (CIS) are adsorbed on metal surfaces, where they form tight hydro- phobic films if present in sufficient concentration. These hydrophobic films act as barrier between the metal surface and the surrounding air and thus greatly impede atmospheric corrosion. As result, there is correlation between the results of the hydrophobing measurements according to Wilhelmy and corrosion tests which simulate atmospheric corrosion. Emulsions with the same composition and virtually the same corrosion-inhibiting effect, but different stabilities, were produced by varying the production parameters. The addition of polymers improved the stability of an emulsion, but led to an increase in the corrosion rate with the substances used up to now. The corrosion-inhibiting effect of rust-inhibiting emulsions can be improved for ecific CI by selecting suitable emulsifier component. Thus, an improvement in stability anfcorrosion-protection proper