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Ochrona przed Korozją” (Corrosion Protection) No 09/2017

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

 

DOI: 10.15199/40.2017.9.1

Self-stratification in organic coating technology

KUCZYŃSKA H.

LANGER E.

Institute for Engineering of Polymer Materials and Dyes, Torun

WAŚKIEWICZ S.

Silesian University of Technology, Faculty of Chemistry, Gliwice

Self-stratifying coating compositions constitute an interesting solution in the field of coating technology. Compared to conventional coatings, they form stronger adhesive bonds between the particular layers, which penetrate into one another at phase boundaries. They constitute effective and economical method for the application of two layers in one operation. The results of research on self-stratifying coatings, which have been carried out over the last 10 years at the Institute for Engineering of Polymer Materials and Dyes, have been discussed. A summary of the test results is provided of non-pigmented compositions containing epoxy resin and acrylic polymer, as well as a blend of two acrylic polymers with different physical, chemical and thermodynamic properties. The influence of decorative and anticorrosive pigments on the separation of resins and pigments and on the protective properties of epoxy-acrylic systems is presented.

Keywords: coatings, self-stratification, phase separation, pigment distribution

2017

Vol. 60, nr 9

pp.295-299

Ref. 16

 

 

DOI: 10.15199/40.2017.9.2

Influence of environmental factors on acrylic topcoats destruction

KOTNAROWSKA D.

SIRAK M.

Instytut Eksploatacji Pojazdów i Maszyn, Wydział Mechaniczny, Uniwersytet Technologiczno-Humanistyczny, Radom

The paper presents results of investigations on environmental factors influence on destruction of acrylic topcoats constituted as superficial layer of coating systems used for car bodies renovation. The 30 month ageing of these systems samples at climatic station caused a chemical destruction of the acrylic topcoats which was documented using methods of X-ray diffraction and IR spectroscopy (FTIR). This ageing caused also physical destruction of the topcoats because, with ageing period flow, their hardness as well as their roughness evaluated by Ra, Rz and Rt parameters increased. What more, it was stated with the help of SEM methods that cracks (silver cracks in this number), craters and etchings occurred on the surface of aged acrylic topcoats.

Keywords: acrylic topcoat, climatic ageing, coating destruction

2017

Vol. 60, nr 9

pp.300-305

Ref. 33

 

 

DOI: 10.15199/40.2017.9.3

Risk of divergent interpretation of standards for pull-off adhesion testing – analysis of no consistency in steel substrate thickness

KRAWIEC K.

CZERNECKA K.

Instytut Inżynierii Materiałów Polimerowych i Barwników w Toruniu, Oddział Farb i Tworzyw w GliwicachThe provisions of pull-off test standards used to determine coating adhesion prior to artificial aging and post exposure to artificial atmospheres in accelerated ageing tests acc. PN-EN ISO 12944-6: 2001 have been analysed. A number of factors have been identified that may affect tensile stress test results, with particular emphasis on the influence of steel substrate thickness. It was shown that the breaking strength of paint systems is not constant and is strongly influenced by the thickness of the steel substrate the measurement is made on.

Keywords: inconsistency of pull-off test standard provisions, pull-off method, steel substrate thickness

2017

Vol. 60, nr 9

pp.306-313

Ref. 16

 

 

DOI: 10.15199/40.2017.9.4

Passivation of hydrogen storage alloy in strong alkaline solution

BALA H.

BORDOLIŃSKA K.

STEFANIAK A.

Faculty of Production Engineering and Materials Technology, Department of Chemistry,

Częstochowa University of Technology, Częstochowa, Poland

Anodic potentiodynamic polarization of dehydrogenated LaNi4.5Co0.5 compact electrode at very slow potential scan rate has been applied to evaluate material corrosion rate in 6 M KOH within passive region. Chronoamperometric measurements carried out at E = –0.2 V (HgO/Hg) allowed to obtain steady state anodic current of electrode passivation which corresponds to alloy stationary corrosion rate. It has been shown that corrosion rate determined in such a way is in very good agreement with alloy initial corrosion rate found on the basis of capacity fade of powdered, composite electrode prepared from this material.

Keywords: hydrogen storage alloy, anodic polarization, passivation, chronoamperometric curve, corrosion rate

2017

Vol. 60, nr 9

pp.314-317

Ref. 13

 

 

DOI: 10.15199/40.2017.9.5

Oxidation behavior of Co-Al-Mo-Nb and Co-Ni-Al-Mo-Nb new tungsten-free γ-γ′ cobalt-based superalloys

MIGAS D.

MIKUŚKIEWICZ M.

NIEMIEC D.

GODZIERZ M.

Silesian University of Technology, Institute of Materials Science, Katowice

This paper presents the oxidation behavior of tungsten-free γ-γ’ Co-10-Al-5Mo-2Nb and Co-20Ni-10Al-5Mo-2Nb cobalt-based superalloys. This type of alloys is an alternative materials for tungsten contains alloys of Co-Al-W type with γ′- Co3(Al.W) intermetallic phase adequate to γ’- Ni3Al phase identified in Ni based superalloys. Applications of Mo and Nb as a replacement of W is related to tendency to lowering the density of alloys. The investigation included thermogravimetric studies up to 1200°C. The oxidized layer was evaluated, therein microstructure, chemical and phase composition analyses were performed using various methods, inclusive of x-ray diffraction, SEM/EDS analysis and light microscopy.

Keywords: tungsten-free cobalt based γ-γ’ superalloys, high temperature oxidation, thermogravimetric investigations

2017

Vol. 60, nr 9

pp.318-322

Ref. 17