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Study and computer modeling of damage of passive state during evaporation from water solutions

100%

Blahetová M. , Lásek S. , Blaheta R.

2007

tom Vol. 321, z. 89

83-84

The stainless steels and related alloys with sufficient resistance to a general corrosion can be susceptible to a localized corrosion in passive state (pitting, cracking, intergranular corrosion) in certain environment under specific conditions. The Drop Evaporation Test (DET) was developed for study of stainless materials resistance to stress corrosion cracking (SCC) at elevated temperatures 100 - 300 °C under constant external load using a chloride containing water solution. In the contribution the initiation and propagation of short cracks as well as pits were observed during the test by the travelling microscope method. The crack initiation and/or propagation can be influenced by the cyclic thermal stresses, when the diluted water solution drops cool down the hot sample. We attend to model stress changes in the testing specimens induced by cooling the heated sample by failing water solution drops. The modeling uses finite element analysis of formulated thermoelasticity problem.

A New Water-Insoluble β-Ketoimine as a Potential Agent Capable of Water Treatment Applications

88%

Witt K.

tom Vol. 25, nr 3

120--131

This paper describes the synthesis of the new β-ketoimine 4-(3-triethoxysilylpropylimino)-3-ethyl-pentan-2-one, and studies its structure, solubility in water and complexation properties in terms of the possibility of its further application for water and wastewater treatment, especially for removing metal ions from aqueous solutions. The synthesis procedure consisted of the addition of 3-ethyl-pentane-2,4-dione to 3-aminopropyltriethoxysilane and subsequent elimination of the water molecules. The structure of the resulting compound was confirmed by nuclear magnetic resonance and Fourier transform infrared spectroscopy-attenuated total reflectance. The affinity of the resulting compound for metal ions binding from aqueous solutions was studied using spectrophotometric methods. Moreover, the stability constants of created in this process complexes of a new β-ketoimine with selected metal ions (Ag+, Au3+, Cd2+, Co2+, Cr6+, Cu2+, Fe3+, Mg2+, Ni2+, Pd2+, Pt2+ and Zn2+) was determined and it was found that the stability of created complexes of L:M with molar ratios equal 1:1 are changing as follows: Pd2+ > Cr6+ > Pt2+ > Ni2+ > Cd2+ > Cu2+ > Ag+ > Fe3+ > Zn2+ > Co 2+> Au3+ > Mg2+.