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„Ochrona przed Korozją” (Corrosion Protection) No 03/2017

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

 

DOI: 10.15199/40.2017.3.1

Using non-destructive methods for measurementof reinforcement corrosion in practice

BRODŇAN M.

KOTEŠ P.

BAHLEDA F.

University of Žilina, Department of Structures and Bridges

ŠEBÖK M.

KUČERA M.

University of Žilina, Department of Measurement and Applied Electrical Engineering

KUBISSA W.

Warsaw University of Technology (branch in Plock), Institute of Building

The paper deals with a description of selected methods, by which it is possible to detect the corrosion loss of steel reinforcement, based on the recorded change in electrical resistance at the time. By verification the suitability of using these methods in previous researches [1, 5, 7, 15] we prepared new samples with required dimensions withinproject APVV- 14-0772. Formation and progression of corrosion [2, 3, 6, 8–10, 13, 14] we will monitor on samples of reinforcing steel in the form of separate bars and in bars embedded in concrete. There will be also used samples of structural steel. Part of the samples will be exposed to the atmospheric environment and the remaining samples will be subjected to accelerated tests in climatic chambers. Real type of corrosion (uniform corrosion, non-uniform corrosion, pitting corrosion, etc.) of samples will be assessed visually and by means of scanning electron microscopy (SEM).

Keywords: corrosion, reinforcement, reinforced concrete, non-destructive methods, electrical resistance

2017

Vol. 60, nr 3

s. 55-58

Ref. 15

 


 

DOI: 10.15199/40.2017.3.2

Sherardizing as the anticorrosion protection of fasteners –preliminary research

JĘDRZEJCZYK D.

SKOTNICKI W.

Akademia Techniczno-Humanistyczna

In the paper the corrosion resistance of the fasteners - M10 screws and flat samples made of 23MnB4 steel were compared after hot-dip and thermal diffusion galvanizing (sherardizing). Corrosion examinations were conducted in a salt spray chamber, in the neutral NaCl fog (according to PN-EN ISO 9227). The achieved results were compared to these which was determinated in analogous conditions for the samples after galvanizing and protected by lamellar zinc coating. In order to explain the diversity of determined and literature corrosion resistance of thermal diffusion coating, on the cross section and the outside surface of the

thermal diffusion coating (and hot-dip galvanizing – for comparison) microscopic observation was conducted using the scanning microscope and EDS analysis. The performed examinations showed, that fasteners after sherardizing reveal the lowest corrosion resistance amongst compared methods inside the examined environment. Achieved results are a consequence of both the too small thickness, and the improper structure of the coating and to its improvement an optimization of process parameters is necessary.

Keywords: zinc coatings, thermal diffusion galvanizing, sherardizing, fasteners, corrosion resistance

2017

Vol. 60, nr 3

s. 59-64

Ref. 12

 


 

DOI: 10.15199/40.2017.3.3

Problems with anticorrosion coatings of bridge equipment elements

KOWALSKI D.

Politechnika Gdańska, Wydział Inżynierii Lądowej i Środowiska,

Katedra Konstrukcji Metalowych i Zarządzania w Budownictwie

The problem of defective corrosion protection concerning paint, protective and decorative coatings of steel barriers elements, made on hot dip galvanized coating, is presented in the paper. Examples taken from various objects represent a recurring problem of the coating system delamination, regardless of the nature of the paint products and resulting with significant growth of corrosion on the zinc surface. Attention was also drawn to other cases of irregularities concerning the same elements, but occurring due to lack of proper supervision during the execution of corrosion protection works.

Keywords: powder paint, polyester powder coating, bridge building, safety barrier for bridges, paint coating on galvanized steel, duplex coating, coating defects, execution errors

2017

Vol. 60, nr 3

s. 65-68

Ref. 17

 


 

OCHRONA PRZED KOROZJĄ W PRAKTYCE

DOI: 10.15199/40.2017.3.4

Performance of corrosion protection of steel elements in hydraulic structures in the sea’s harbours

SZYPIŁOW A.

DOBRZYKOWSKI A.

GT Poland Ltd. Sp. z o.o., Gdańsk

The methodology and performance techniques of anti-corrosion protection of steel parts of the maritime structures utilised in sea water, especially in the intertidal and splashing water zones are described. The presented procedure is based on the corrosion protection works performed on maritime structures in the Northern Port in Gdansk, Poland. The execution of protection works in line with the provisions of PN-EN ISO 12944 was possible following a formulation of a workplace set-up method by creating dry space around the renovated structures.

Keywords: maritime structures, corrosion in intertidal and in splashing water zone, renovation of corrosion protection

2017

Vol. 60, nr 3

s. 69-71

Ref. 12

 


 

OCHRONA PRZED KOROZJĄ W PRAKTYCE

DOI: 10.15199/40.2017.3.5

Impact of acoustics screens’ construction, design, implementation and installation on their corrosion and durability

MACIEJEWSKI A.

Acoustic screens are a relatively new type of structure; they were created in XX century along with the rapid development of road and railway communication. They are quite neglected in Poland, which is the cause of our screens’ poor technical condition. The most suitable screen in our country should be entirely prefabricated reinforced concrete structure whose advantages were listed in the article. A typical design of reinforced concrete screen with variants should be created for different regions of Poland. The best, and stirring no controversy, are earth embankments, embankments with vegetation or embankments with reinforced concrete top structure. Well-designed greenery belts are a good choice as well. However, it is a great mistake to construct ‘prospective’ screens along forests, meadows or wastelands.

Keywords: reinforced concrete acoustic screens, earth embankments, embankments with vegetation, embankments with reinforced concrete top structure, dense greenery belts, typical design of reinforced concrete screen

2017

Vol. 60, nr 3

s. 72-74

Ref. 8