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„Ochrona przed Korozją” (Corrosion Protection) No 10/2018

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

 

RESEARCH ARTICLES

 

DOI: 10.15199/40.2018.10.1 

Hybrid method as the innovation solution in spraying technology of protective coating

SZCZUCKA-LASOTA B.

SZYMAŃSKI K.

Politechnika Śląska, ul. Krasińskiego 8, 40-019 Katowice

PIWNIK J.

Politechnika Białostocka,ul. Wiejska 45, 15-300 Białystok

WĘGRZYN T.

Politechnika Śląska, ul. Krasińskiego 8, 40-019 Katowice

The paper presents an innovative hybrid method (HM) as a modification of the supersonic spraying process of coating material, that was designed to limit the total spraying costs of the coating including material and energy consumption in the spraying process. This method makes it possible to produce protective coatings with similar operating characteristics to the classic HVOF method. In the paper the results of the oxidation resistance of HM coatings were presented. The presented oxidation test was carried out in laboratory conditions. The test was cyclical. It was run at 650oC and 500 hours. The results of structural studies on corrosion products formed on the coatings during the test are presented. The high resistance of the tested materials is determined by their chemical and phase composition and the obtained compact structure of coating. The results show, that the chosen parameters of spraying in the innovative method are correct and the results confirm its ability to produce a compact, density coatings with significant corrosion resistance.

Keywords: thermal spraying, innovation technology, hybrid method, protective coating

2018, Vol. 61, nr 10, pp. 286-291

Ref. 25

 

 

DOI: 10.15199/40.2018.10.2

Corrosion of the elements of fuel gas desulfurization installations

MOSKAL G.

HERNAS A.

Silesian University of Technology, Institute of Materials Science, Katowice, Poland

The article presents the test results for the corrosion of heat exchanger basket frames in fuel gas desulfurization installations. The frames were made of austenitic steel type Ni-Cr modified by 4% Mo (904L), with the aim to improve the pitting corrosion resistance. An assessment of the chemical and the phase composition of the deposits present on the surface of the tested elements was performed, and the presence of a large amount of sulfides different types. Such a chemical composition of the deposits, in combination with the humidity present under the working conditions at the temperature above 100°C, caused the creation of the conditions favorable for intense processes of pitting corrosion. Despite the presence of molybdenum in the steel, very strong effects of pitting corrosion, penetrating deeply inside the substrate material, were observed.

Keywords: fuel gas desulfurization installations, crevice corrosion, 904L steel

2018, Vol. 61, nr 10, pp. 292-299

Ref. 5

 

 

CORROSION PROTECTION IN PRACTICE

Quality control of steel structures protected with zinc anticorrosion coatings, with various research methods applied

DYRDA M.

Huta Pokój S.A.

BUGAJSKI J.

Komplex Sp. z o.o.

In the study, there are presented requirements of the standard EN ISO 1461 and DASt 022 guidance in terms of control and zinc anticorrosion coatings tests. Test methods for zinc anticorrosion coatings were characterized in order to confirm a degree of conformance with the requirements. Effectiveness of non-destructive methods that are used to find defects of zinc coating – cracks was presented and assessed. As for measuring the thickness of coatings, in addition to the most commonly used magnetic method, there are presented alternative destructive methods.

Keywords: control, zinc coating, corrosion, laboratory, Non Destructive Testing

2018, Vol. 61, nr 10, pp. 300-305

Ref. 16