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„Ochrona przed Korozją” (Corrosion Protection) No 12/2017

 

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

 

RESEARCH ARTICLES

 

DOI: 10.15199/40.2017.12.1

New, nondestructing diagnostic method of corrosion for reinforced concrete structures

FILIPEK R.

PASIERB P.

Akademia Górniczo-Hutnicza w Krakowie, Wydział Inżynierii Materiałowej i Ceramiki

KRÓLIKOWSKA A.

KOMOROWSKI L.

Instytut Badawczy Dróg i Mostów w Warszawie

DEJA J.

ŁAGOSZ A.

MIGDALSKI J.

LEWENSTAM A.

Akademia Górniczo-Hutnicza w Krakowie, Wydział Inżynierii Materiałowej i Ceramiki

PLECHA T.

TPA Sp. z o.o.

KASZUBA S.

Centrum Technologiczne BETOTECH Sp. z o.o.

Destructive methods of corrosion diagnosis of reinforced concrete structures are still very common. Visual inspection involves removing of outer concrete layer or cutting samples for analysis in laboratory. Some nondestructive methods of corrosion investigation are also commercially available. In this paper, a new nondestructive method of rebar corrosion diagnosis in concrete structures is presented. It is based on complementary analysis of results obtained from three electrochemical techniques: electrochemical impedance spectroscopy (EIS), open circuit potential and galvanostatic pulse method and performed on-site. EIS is commonly used in the laboratory measurements, but on-site measurements are still very rare. Based on worked out electrodes set measurements are performed for places critical for the construction or particularly exposed to depassivation factors like chlorides. Complex analysis based on three different electrochemical techniques enables determination of corrosion presence in reinforced structures in nondestructive way.

Keywords: corrosion, reinforced concrete structures, nondestructive method

2017

Vol. 60, nr 12

pp.391-395

Ref. 26

 

 

DOI: 10.15199/40.2017.12.2

Antimony microelectrode for measurement of the near-surface pH during corrosion of untreated and nitrided 316L stainless steel

FLIS-KABULSKA I.

Uniwersytet im. Kardynała Stefana Wyszyńskiego (UKSW), Warszawa

FLIS J.

Instytut Chemii Fizycznej PAN, Warszawa

A simple antimony microelectrode was prepared for facile measurements of pH at a small distance from the examined surface. It can be easily placed at a fixed and reproducible distance. The microelectrode enabled a measurement of a decrease of pH during pit formation on untreated stainless steel 316L, and of a rise of pH on plasma nitrided steel in the active potential region. The latter was ascribed to binding of protons into NH4+ following the reduction of nitrogen from steel. Measurements of changes of pH close to the surface can contribute to identification of electrode processes occurring at chosen potentials.

Keywords: Sb microelectrode, near-surface pH, nitrided steel

2017

Vol. 60, nr 12

pp.396-399

Ref. 20

 

 

DOI: 10.15199/40.2017.12.3

Modern one-, two- and three-coat systems for long-term protection of steel structures

ZUBIELEWICZ M.

ŚLUSARCZYK A.

KAMIŃSKA-BACH G.

Instytut Inżynierii Materiałów Polimerowych i Barwników, Oddział Farb i Tworzyw, Gliwice

KRÓLIKOWSKA A.

KOMOROWSKI L.

Instytut Badawczy Dróg i Mostów, Warszawa

The test results of protective properties of anticorrosive one-, two- and three coat systems – containing epoxy, acrylic, polyurethane, glass flake reinforced polyester and fluoropolymer paints – are discussed. Laboratory tests – covered physio-mechanical properties (adhesion, hardness, impact resistance) and protective properties in constant (salt spray test, humidity test, UV radiation) and changing conditions (combined effect of salt spray, UV and low temperature) – showed that the one- and twocoat systems can be used to replace traditional three-coat systems and provide long-term protection of steel structures.

Keywords: corrosion, corrosion protection, coating systems, testing

2017

Vol. 60, nr 12

pp.400-405

Ref. 33

 

 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2017.12.4

Destruction of acid-proof coating

BORDZIŁOWSKI J.

CES, Gdańsk

Destruction of acid-proof coating on industrial tank in the acidic environment and increased temperature was presented. It was found that the main reason of destruction were neither failure painting nor the incorrect choice of coatings but design failures of the tank construction.

Keywords: acid-proof coatings, industrial tanks, acidic environment

2017

Vol. 60, nr 12

pp.409-410

Ref.-