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„Ochrona przed Korozją” (Corrosion Protection) No. 03/2016

View cover and table of contents (in Polish and English) (pdf)

 

DOI: 10.15199/40.2016.3.1

Effectiveness of selected ionic liquids affecting microorganisms causing ”in can” degradation of emulsion paints

MICHALCZYK A.

CIENIECKA-ROSŁONKIEWICZ A.

The Institute of Industrial Organic Chemistry, Department of Pesticide Use and Formulation,

Annopol 6, 03-236 Warsaw, Poland

The activity of some ionic liquids as potential agents protecting emulsion paints against microbial degradation was tested as a part of the search for new, effective biocides for the preservation of paints under the conditions of manufacture and storage. The bactericidal and yeasticidal effectiveness of five ionic liquids was examined in relation to the bacteria isolated from spoilt white emulsion paint ”Śnieżka”, and against strains of bacteria and yeast most frequently damaging paints. The activity of ionic liquids was compared with that of benzalkonium chloride, which is the active ingredient of a variety of biocidal formulations, and with the effectiveness of known biocides based on isothiazolones and formaldehyde donors used in the preservation of emulsion paints. The strongest activity against the tested microorganisms was of didecyldimethylammonium nitrate. The compound was more effective than the commercial biocides Acticide FS(N) and Acticide MSB used in the preservation of emulsion paints, and its activity was much stronger than in the case of benzalkonium chloride.

Keywords: ionic liquids, antimicrobial activity, painting materials

2016

Vol. 59, nr 3

s. 62-65

Ref. 36 


DOI: 10.15199/40.2016.3.2

Corrosion performance of aluminum zinc coated steel in tomato, orange and pineapple juices

ADETUNJI O. R.

AKINYEMI O. J.

KUYE S. I.

Mechanical Engineering Department, Federal University of Agriculture Abeokuta, P.M.B. 2240, Abeokuta, Nigeria

DARE E. O.

Chemistry Department, Federal University of Agriculture Abeokuta, P.M.B. 2240, Abeokuta, Nigeria

Fruit juice processing facilities, storage and waste fruits disposable cans are sourced based on several considerations ranging from cost, durability and health implications. This study evaluated the corrosion performance of Aluminum zinc coated steel (Aluzinc), in three media (tomato, orange and pineapple juices). These media were chosen due to their social and economic importance. Samples of Aluzinc, were prepared by cutting into 3 × 3 cm from 0.5 mm thick plate. Three of the prepared samples were used for Potentiodynamic Polarization Experiments (PPE) while 54 samples were used for Weight Loss Method (WLM). Each of the prepared samples for WLM was cleaned, weighed and immersed in the media for 30 days. The samples were removed at the end of immersion, cleaned and reweighed. The weight losses obtained for WLM were used to evaluate the corrosion rates. The results obtained for the corrosion rates in mm/yr using PPE in orange, pineapple and tomato juices were 0.0065, 0.0303, and 0.0062 for Aluzinc. The measured pH values for the media ranged from 4.1 to 8.3. The corrosion rate of aluzinc was highest in Pineapple juice than in Tomato and Orange juice after 30 days immersion in the media. SEM images of corroded metallic samples indicated the effect of corrosion on them.

Keywords: potentiodynamic polarization, weight loss, fruit juices, corrosion rates

2016

Vol. 59, nr 3

s. 66-69

Ref. 10

DOI: 10.15199/40.2016.3.3


The effects of electrochemical polarization of zircaloy 4 in 0.1 M NaOH

GAJEK A.

ZAKROCZYMSKI T.

Instytut Chemii Fizycznej PAN, Warszawa

Zircaloy 4 was potentiostatically polarized at various electrode potentials in 0.1 M NaOH. The effects of an applied potential on a shape of current curves and on morphology (SEM) and chemical composition (EDS) of a surface region of the alloy were studied. It was found that the anodic polarization seals the passive layer or even causes an increase in the passive layer thickness. A relatively mild cathodic polarization (|i| > 30 μA/cm2) resulted overcome the protective properties of the passive layer. In consequence the rate of hydrogen evolution clearly increased and hydrogen blisters and cracks in the surface of the alloy were formed.

Keywords: zircaloy, hydrogen corrosion, passivation

2016

Vol. 59, nr 3

s. 70-73

Ref.. 7


DOI: 10.15199/40.2016.3.4

Non-standard optical techniques used in the studies of electrochemically passivated Ti6Al7Nb alloy

WOLSKA N.

Elkom Trade S.A., Ostrowiec Świętokrzyski, Poland

Cracow University of Technology, Faculty of Mechanics M2, Cracow, Poland

JAGLARZ J.

Cracow University of Technology, Faculty of Mechanics M2, Cracow, Poland

SZEWCZENKO J

Department of Biomaterials and Medical Devices Engineering, Faculty of Biomedical Engineering,

Silesian University of Technology, Gliwice, Poland

The aim of this work is presentation of optical techniques applied for the measurements of topographic parameters of Ti alloy before and after its passivation, as well as determination of the influence of pre-treatment methods on the thickness of passive films. The applied methodology is non destructive and it includes standard and non-standard optical techniques to determine the thickness, roughness, autocorrelation length and other statistic parameters of film. Advantage of presented non-standard techniques is their non-destructive and non-invasive character.

Keywords: Ti6Al7Nb alloy, BRDF (Bidirectional Reflection Distribution Function), light scattering, thin films optic, passive layer

2016

Vol. 59, nr 3

s. 74-78

Ref. 13


 DOI: 10.15199/40.2016.3.5

Damages of concrete pavements due to faulty aggregate quality

GRUSZCZYŃSKI M.

Politechnika Krakowska

PASZEK U.

Instytut Badawczy Dróg i Mostów

Aggregates applied for pavement concrete production and especially for constructing grinding layer are subjected to codes classification according to determined criteria and testing methods. One of the most important properties that should be estimated within the aspect of pavement durability is freeze resistance. The problem of significant damages appearance on concrete pavement caused by the lack of freeze resistance of a certain part of the overall composition of aggregate used for grinding layer that after two winter-spring seasons resulted in total disqualification of executed layer is presented. Aggregate admitted for the mix during code tests did not indicate any basis for disqualification. Presented problem hence refers to the verification of correctness of recommended tests and codes criteria for aggregates for concrete pavements.

Keywords: aggregate, concrete durability, freeze resistance, concrete pavement

.2016

Vol. 59, nr 3

s. 79-85

Ref. 9