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„Ochrona przed Korozją” (Corrosion Protection) No 05/2020

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

 

 RESEARCH ARTICLES

 

DOI: 10.15199/40.2020.5.1

The effect of alloying bath additives on the corrosion resistance of zinc coatings obtained on reinforcing steel

SATERNUS M.

Politechnika Śląska, Gliwice, Wydział Inżynierii Materiałowej, 40-019 Katowice, Krasińskiego 8

SIPA J.

Remix S.A., 66-200 Świebodzin, Poznańska 36

KANIA H.

Politechnika Śląska, Gliwice, Wydział Inżynierii Materiałowej, 40-019 Katowice, Krasińskiego 8

The article presents the results of research determining the effect of the bismuth and tin addition to the zinc bath on the corrosion resistance of coatings obtained on reinforcing steel. Coatings for research were made on B500SP steel in a zinc bath containing AlBi and AlBiSn additions. The corrosion resistance of the coatings was compared with the corrosion resistance of the coating obtained in the Zn-Al bath. The microstructure was revealed as well as the thickness of the coatings was determined. The corrosion resistance of the coatings was determined comparatively in a standard corrosion test in neutral salt spray. The tests in the salt chamber were carried out in accordance with the PN-EN ISO 9227 standard. It was found that the addition of bismuth and BiSn decrease the corrosion resistance of coatings on B500SP reinforcing steel.

Keywords: hot dip galvanizing, zinc coatings, reinforcing steel, corrosion resistance

2020, Vol. 63, No 5, pp. 137-143

Ref. 28

 

DOI: 10.15199/40.2020.5.2

General rules for rational selection of chemical composition zinc alloys for galvanizing process

ZASADA J.

Ocynkownia Śląsk Sp. z o.o. , 32-500 Chrzanów, ul. Kroczymiech 38

LIBERSKI P.

Politechnika Śląska, Gliwice, Wydział Inżynierii Materiałowej, 40-019 Katowice, Krasińskiego 8

Knowledge-based (rational) selection of the chemical composition of immersion galvanizing alloys should be carried out taking into account a number of aspects affecting the functional properties of the coatings produced in them as well as the technological suitability of the bath for the metallization process. The selected composition of the zinc alloy should provide the appropriate melting temperature on the process of the metallized, viscosity, etc. And above all, adequate protection of the surface of the workpiece. Protection should be understood as adequate anti-corrosion properties, good adhesion to the substrate and susceptibility to further surface refining process shell. The hot dip galvanizing alloy is selected for the galvanizing technology used. That was, for the production of zinc coatings of continuous method, it is necessary to use a bath with the appropriate composition, other than for the production of coatings by the individual immersion method. The standards applicable in the technology of immersed zinc coatings (mainly PN EN 1461) do not specify the bath composition but only the maximum amount of alloy additives. The paper presents the analysis of available knowledge on the impact of the most commonly used alloying elements added to the zinc bath. Based on the literature analysis and the results of tests and own experiments, the interaction of selected elements to the iron is presented as an individual addition to pure zinc as well as in synergic interaction with other alloy additions. The above are presented against the background of their interaction in a zinc bath with iron alloys with a characteristic share of silicon.

Keywords: hot dip galvanizing, zinc coatings, zinc bath

2020, Vol. 63, No 5, pp. 144-151

Ref. 66

 

DOI: 10.15199/40.2020.5.3

Structure and growth kinetics of zinc coatings on reinforcing steel B500SP

KANIA H. 

Politechnika Śląska, Gliwice, Wydział Inżynierii Materiałowej, 40-019 Katowice, Krasińskiego 8

SIPA J.

Remix S.A., 66-200 Świebodzin, Poznańska 36

SATERNUS M.

Politechnika Śląska, Gliwice, Wydział Inżynierii Materiałowej, 40-019 Katowice, Krasińskiego 8

 

The paper presents the results of research carried out to determine the synergistic effect of alloying additives for zinc bath on the structure and kinetics of growth of coatings obtained on reinforcing steel. The structure and chemical composition of coatings obtained on B500SP steel were developed. The tests were carried out in Zn-Al, Zn-AlBi and Zn-AlBiSn baths. It has been found that Bi and Sn additives reduce the thickness of the coating on the B500SP reinforcing steel at a tinning temperature of 440oC, while at higher temperature these additives can increase the thickness of the coating. The growth kinetics of the coatings on the tested reinforcing steel, although the Si concentration was in the Sebisty range, did not show an inverted temperature relationship. Coatings obtained on B500SP steel have the structure typical of Sebisty steel. Regardless of the composition of the bath, the coating is made of δ1 and ζ phase layers. An increase in temperature results in a more complex and thicker crystalline phase ζ.

Keywords: hot dip galvanizing, zinc coatings, reinforcing steel, B500SP

 

2020, Vol. 63, No 5, pp. 152-157

Ref. 22