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„Ochrona przed Korozją” (Corrosion Protection) No 10/2017

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


DOI: 10.15199/40.2017.10.1

Polarization tests concerning chloride impact on protective zinc coatings applied on reinforcing steel in curing concrete



Wydział Budownictwa, Politechnika Śląska

We analysed chloride impact on steel rebars with protective zinc coatings and compared them with rebars without any protective coatings. The rebars were tested in concrete with chloride content of 2% cement weight and in reference concrete without chlorides. Polarization tests were conducted in the potentiodynamic mode in the three-electrode system, where the working electrode was the rebar made of ribbed steel of grade RB500, placed in concrete. The tests began two weeks after placing specimens in concrete. They were continued in one- and twoweek intervals. The test results showed that at the early maturity age of concrete, quite intensive electrochemical processes took place on the zinc coat surface regardless of chloride presence. When concrete was fully matured, that is, after 28 days according to the standard, electrode processes significantly slowed down and then stabilised.

Słowa kluczowe: concrete structures, reinforcing steel, corrosion, chlorides, zinc coating, potentiodynamic measurements, corrosion current density


Vol. 60, nr 10


Ref. 23



DOI: 10.15199/40.2017.10.2

Hot dip galvanizing of steel products in new zinc alloy WEGAL-CuTi



Instytut Metali Nieżelaznych, Gliwice

The paper presents the results of batch hot dip galvanizing of low-silicon (08X) and reactive (S235JRG2) steel samples in the bath of WEGAL alloy without addition of tin, increased content of manganese and addition of copper and titanium (ZnAl0.1Ni0.1Mn0.2CuTi). The microstructure of the examined alloy was presented including the phases determination. The solidus of the new alloy was determined by thermal analysis in the solidification process. The hot dip galvanizing was carried out at temperature of 445°C with retention time of 600 s. The microstructure and thickness of coating on both steel grades were examined. The coating adhesion and plasticity were examined in bending test of coated samples on a steel mandrel (radius of 5 mm and angle of 180°). The outside bend edges were visually evaluated. The coatings showed good plasticity and aesthetic appearance. The achieved results confirmed that coating growth kinetics depends mainly on dominant part of bath chemical composition.

Keywords: zinc, zinc alloy, hot-dip galvanizing, zinc coating, zinc bath, WEGAL-CuTi alloy


Vol. 60, nr 10


Ref. 16



DOI: 10.15199/40.2017.10.3

Inhibitive Efficiencies of Some Selected Liquid Hydrocarbons as Anti-Corrosives for Stainless and Mild Steel Samples in HCl




Mechanical Engineering Department, Federal University of Agriculture, Abeokuta,

P.M.B.2240, Abeokuta, Ogun State, Nigeria


Environmental Management and Toxicology Department, Federal University of Agriculture, Abeokuta,

P.M.B.2240, Abeokuta, Ogun State, Nigeria


Physics Department, Federal University of Agriculture, Abeokuta,

P.M.B.2240, Abeokuta, Ogun State, Nigeria

Corrosion is the deterioration of metallic materials due to interaction with its environment which limit their uses in various capacities. In petroleum industries, these metals are exposed to varying intensity of loading with harsh environmental conditions that further shorten their service lives. This study evaluated the inhibition efficiency of petrol, kerosene and diesel on the corrosion performance of Mild Steel (MS) and Stainless Steel (SS) in HCl using Potentiodynamic Polarization (PP). The PP was carried out using 8 metallic samples as working electrodes, 1 M HCl and 0.1% each of petrol (PHCL), diesel (DHCL) and kerosene (KHCL) as separate inhibitors in 1 M HCl as media with 1.2 pH value. Corrosion current densities were determined from PP experiments and used for Corrosion Rates (CR) determination. The pH of the media was recorded. The Scanning Electron Microscope (SEM) images of the corroded samples were carried out. The CR of SS from PP was 0.0549, 0.0199, 0.0066 and 0.0093 mm/yr for HCL, PHCL, DHCL and KHCL respectively. Likewise, CR of MS was 0.515, 0.009, 0.057 and 0.006 mm/yr respectively. Inhibition efficiency showed the order of SS>MS in DHCL, PHCL and KHCL respectively. The SEM images of SS and MS obtained indicated occurrence of corrosion in the media. Conclusively, the inhibition of corrosion was effective on SS in DHCL while higher CR was obtained for MS in HCl.

Keywords: potentiodynamic polarization, inhibitive efficiency, liquid hydrocarbons, metals, HCl


Vol. 60, nr 10


Ref. 19



DOI: 10.15199/40.2017.10.4

Stress corrosion cracking of leaded brass with various aluminium and tin content


Silesian University of Technology, Faculty of Mechanical Engineering, Department of Foundry Engineering

The paper presents studies on stress corrosion of cast leaded copper-zinc alloys containing aluminium and tin additions. The analysis of alloys susceptibility to this process was conducted on the base of the modified ammonia test which consisted of impact test results comparison for studied alloys after different time of exposure. Additionally, the structure was examined using electron and optical microscopy methods. Results of the studies have shown different resistance of studied alloys , depending on the chemical composition to the process of stress corrosion cracking.

Keywords: copper alloy, brass, corrosion, stress corrosion, cracking


Vol. 60, nr 10


Ref. 8




DOI: 10.15199/40.2017.10.5

Surface treatment technology of Zn coated elements


Chemetall Polska Sp. z o.o., Warszawa

Duplex coatings are today best protection of steel construction elements, guaranteeing their long-term exploitation in the harshest weather conditions. Before covering the galvanized surface by paint coating abrasive blasting is most commonly used, which aims is to remove impurities, the oxide layer and increase adhesion by growth of surface roughness. In the case of painting thin-walled components application of abrasive blasting is not possible. In these cases, there are used various chemical surface treatments, whose task is to produce a conversion coating that ensures both a good adhesion of the paint coating to the substrate, and long-term corrosion protection. This lecture presents an overview of chemical surface treatment technologies, possible to apply for Duplex coatings.

Keywords: Duplex coating, galvanized steel, chemical surface treatment, phosphating


Vol. 60, nr 10


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