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„Ochrona przed Korozją” (Corrosion Protection) No 07/2016

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

 

DOI: 10.15199/40.2016.7.1

The effect of counter electrode width on the polarization range around the rebar circumference during impedance measurements

JAŚNIOK M.

PAMUŁA M.

Department of Building Structures, Silesian University of Technology

This paper concerns the polarization tests on steel reinforcement in a solution simulating concrete pore solution. It describes an attempt to evaluate the effect of polarization range measured in an unusual way, that is, around the rebar circumference, and not along its length. Tests were conducted in a three-electrode system by impedance spectroscopy. A working electrode was a steel bar with a diameter of 22 mm, made of reinforcing steel of grade RB500. Cl–/AgCl,Ag electrode was used as a reference electrode, and a counter electrode was made of corrosion-resistant steel sheet. Three geometric parameters of the system: polarization of circumferential range, the counter electrode width and the counter electrode distance from the tested rebar were considered as variables during the tests. A discrete change in the circumferential range of polarization was achieved by decreasing gradually the level of an aqueous solution in a container with electrodes. The container was filled with synthetic pore solution with pH = 13.4, in which passivation of the steel bar was expected. The analysed test results indicated that the counter electrode width could have an impact on the fact that the linear relationship between charge transfer resistance and the polarization range around the rebar circumference was not repeatable.

Keywords: concrete structures, reinforcing steel, concrete pore solution, polarization range, charge transfer resistance, impedance spectroscopy, EIS, simulation

2016

Vol. 59, nr 7

s. 231-237

Ref. 14

 


 

DOI: 10.15199/40.2016.7.2

Analysis of damage reasons of zinc galvanized fasteners

SZŁAPA I.

F.Ś. BISPOL S.A. Bielsko-Biała

JĘDRZEJCZYK D.

Akademia Techniczno-Humanistyczna, Bielsko-Biała

In the paper, reasons for zinc galvanized fasteners damage – self tapping screw M8×25 mm were analysed. The examinations concerned the analysis of fractures created as a result of screw cracking, the verification of structure correctness achieved after the heat treatment, hardness measurement at the screws cross section as well as inspections of the hydrogen content. Based on the conducted examinations it was stated that the main reason for analysed screw cracking was steel hydriding – hydrogen brittleness which could take place in individual stages of the production process. Measured hydrogen content significantly exceeds the acceptable values, and observed fractures are characteristic for brittle cracking.

Keywords: zinc coatings, galvanizing, hydrogen brittleness, brittle cracking

2016

Vol. 59, nr 7

s. 238-243

Ref. 13

 


 

DOI: 10.15199/40.2016.7.3

Corrosion resistance of composites Ti–6Al–4V/Al2O3 obtained by spark plasma sintering

DUDEK A.

Institute for Material Engineering, Faculty of Processing Engineering and Applied Physics,

Czestochowa University of Technology

ADAMCZYK L.

Department of Chemistry, Faculty of Processing Engineering and Applied Physics,

Czestochowa University of Technology

LISIECKA B.

Institute of Information Management Systems, Faculty of Management, Czestochowa University of Technology

JANIK M.

Institute of Information Management Systems, Faculty of Management, Czestochowa University of Technology

Attempts to develop materials for manufacturing of medical implants which combine biocompatibility, porosity and certain strength parameters involve substantial difficulties. One of the most recent materials are metallic-ceramic composites that show strength parameters connected with high bioactivity of various materials. This paper presents an analysis of the structure and corrosion resistance of new composites of Ti–6Al–4V with various additions of ceramics (Al2O3).

Keywords: metallic-ceramic composites, SPS

2016

Vol. 59, nr 7

s. 244-247

Ref. 22

 


 

DOI: 10.15199/40.2016.7.4

 

Mechanical properties and corrosion behavior of nitrided surface layer formed on AISI 4140 steel

JAGIELSKA-WIADEREK K.

Department of Chemistry, Faculty of Production Engineering and Materials Technology,

Czestochowa University of Technology

MAKRENEK M.

Department of Matemathic and Physics,Kielce University of Technology

MOLA R.

Faculty of Mechatronics and Machine Design, Kielce University of Technology

Investigation results under structure and physicochemical properties of glow-discharge nitrided (1:1 vol. N2/H2 atmosphere, 520°C) AISI 4140 steel are presented in the paper. The successive thinning method has been applied to determine the corrosion resistance changes within the cross-section of the nitrided layer. The method consists in step by step polarization corrosion measurements for successive surfacial layers. The potentiokinetic polarization tests were carried out in acidified (pH = 1) 0.5 M sulphate solution. The metallographically prepared specimens were observed with the use of optical microscopy and AFM microscopy. Microhardness measurements of the polished samples from the cross-section were carried out using Vickers indenter and the mechanical properties – using nanohardness meter, CSM, with a load of 80 mN.

Keywords: acid corrosion, depth profile, steel, glow-discharge nitriding

2016

Vol. 59, nr 7

s. 248-251

Ref. 20

 


 

DOI: 10.15199/40.2016.7.5

Corrosion behaviour of aluminium alloys and 316L stainless steel in propylene glycol and ethylene glycol water solution

GRYSAKOWSKI B.

KRAWIEC H.

AGH – University of Science and Technology, Kraków

The corrosion behaviour of two aluminium alloys (AA1050 and AA5052) and 316L stainless steel was studied in 30% ethylene glycol and propylene glycol water-based solution. The sample made of 316L stainless steel exhibits the highest corrosion resistance in all testing solutions. It was shown that investigated aluminium alloys show comparable electrochemical behaviour in both water-glycol solutions. In the case of ethylene glycol testing solution higher values of the cathodic and anodic current densities were found for all investigated samples. Therefore, the solution of ethylene glycol is a more corrosive environment compared to the propylene glycol solution.

Keywords: pitting corrosion, aluminium alloys, stainless steel

2016

Vol. 59, nr 7

s. 252-255

Ref. 10

 


 

DOI: 10.15199/40.2016.7.6

The effect of electropolishing process on the properties of the prosthetic constructions surface

PAWŁOWSKA G.

RADOMSKA K.

Deptartment of Chemistry, Faculty of Materials Processing Technology and Applied Physics,

Technical University of Częstochowa

KLIMECKA-TATAR D.

Institute of Production Engineering, Faculty of Management,Technical University of Częstochowa

The metal alloys used in prosthetics must meet high requirements concerning the biocompatibility and mechanical strength. Additions of metals embedded in the patient’s mouth show the tendency to corrosion. The degree of destruction dependents on the type of alloy and from the mechanical processing. An important aspect of prosthetic work based of dental alloys is not only a correctly performed the melting / casting technology, but also the correct final treatment, conferring the appropriate Surface properties of dental structures. In this paper an impact the effect of the electropolishing process time on the quality of the dental alloys surface. The mechanical surface analysis was performed by useing the contact profilometer. It has been found that the electropolishing process have a significant effect on the stereochemistry of metallic structures.

Keywords: dental alloys, corrosion resistance, electropolishing process, surface roughness

2016

Vol. 59, nr 7

s. 256-259

Ref. 17

 


 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2016.7.7

Impact of solutions’ pH on the corrosion of a selected steel grade

BĘBEN D.

Oil and Gas Institute – National Research Institute / Instytut Nafty i Gazu – Państwowy Instytut Badawczy

When using gas wells there is a loss of steel in the wellbore in the contact area between the production tubing and the casing string. Therefore, research on how pH influences the corrosion intensity along the contact point should be conducted. The research was carried out under simulated conditions of temperature and pressure in a selected wellbore. The results show that the pH of the packer fluid should be ca. 12, which helps to significantly reduce the loss of structural material at the interface between the pipes.

Keywords: pitting corrosion of steel, packer fluid, corrosion inhibitors

2016

Vol. 59, nr 7

s. 260-263

Ref. 11