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„Ochrona przed Korozją” (Corrosion Protection) No 11/2017

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

 

DOI: 10.15199/40.2017.11.1

Inverse methods in corrosion research and materials degradation

FILIPEK R.

SZYSZKIEWICZ-WARZECHA K.

Akademia Górniczo-Hutnicza w Krakowie, Wydział Inżynierii Materiałowej i Ceramiki, Mickiewicza 30, 30-059 Kraków

Applications of inverse methods in corrosion research and materials degradation are demonstrated. Two examples concern corrosion of reinforcement in concrete structures and one concerns a blast furnace. In the first example, a diffusion model and diffusion with reactions model are used to determine a chloride diffusion coefficient in concrete which can be applied to predict the lifetime of a building construction. In the second example, determination of corrosion state based on solution of inverse problems defined for transient response (galvanostatic pulse method) is shown. Finally, it is demonstrated how the inverse problem of the heat transport can be used to estimate degradation of refractory material being in contact with molten metal based on temperature readings in selected locations of the blast furnace.

Keywords: inverse problem, corrosion of reinforcement in concrete, chloride diffusion coefficient, galvanostatic pulse, corrosion rate, heat transport, blast furnace

2017

Vol. 60, nr 11

pp.358-363

Ref. 25

 

DOI: 10.15199/40.2017.11.2

Corrosion resistance of the hot pressed nanocrystalline tantalum alloys

SOPATA M.

KOPER J. K.

JAKUBOWICZ J.

Politechnika Poznańska, Instytut Inżynierii Materiałowej, ul. Jana Pawła II 24, 61-138 Poznań

The paper describes the results of corrosion resistance study of the nanocrystalline tantalum and its alloys. Alloying additives were niobium, molybdenum and tungsten. The starting materials were in the form of the metal powders which were then used in mechanical alloying synthesis. After 48 h of synthesis materials were hot pressed. The corrosion resistance was measured using the potentiodynamic mode in Ringer’s solution. The polarization curves show that the worst resistance has tantalum- niobium alloys and the best resistance has tantalum-molybdenum alloys. Significantly good properties for Ta-W alloy were measured. The results were compared with pure nanocrystalline tantalum which is characterized by 2–3 orders of magnitude higher corrosion current density (worst corrosion resistance) than the best nanocrystalline Ta-Mo and Ta-W alloys.

Keywords: tantalum, nanocrystalline tantalum, tantalum alloys, hot pressing, refractory metals, corrosion resistance

2017

Vol. 60, nr 11

pp. 365-367

Ref. 8

 

DOI: 10.15199/40.2017.11.3

Influence of chitosan coatings on the corrosion resistance of magnesium alloys in sodium sulphate solutions

KRAWIEC H.

SZKLARZ Z.

TISSIER V.

AGH - University of Science and Technology, Faculty of Foundry Engineering, Reymonta 23 street, 30-059 Kraków, Poland

The influence of polysaccharide chitosan coatings on the corrosion resistance of magnesium alloys Mg1Ca, Mg1Ca1Si and Mg4Zn1Ca is studied in 0.1 M sodium sulphate solution. It has been shown that localized corrosion of all magnesium alloys proceeds along grain boundaries and around precipitates. After long-term immersion of magnesium alloys (Mg1Ca and Mg4Zn1Ca) metallic ions are detected in the solution. The chitosan and chitosan/TiO2 composite coatings accelerate corrosion of Mg1Ca, Mg1Ca1Si and Mg4Zn1Ca in sodium sulphate based solutions.

Keywords: pitting corrosion, magnesium alloys, chitosan coatings

2017

Vol. 60, nr 11

pp.368-371

Ref. 17

 

DOI: 10.15199/40.2017.11.4

The effect of bio-tolerated binder content on the corrosive behavior of RE-M-B in magnetic composites in sulphite solutions

PAWŁOWSKA G.

Department of Chemistry, Czestochowa University of Technology, Poland

KLIMECKA-TATAR D.

Department of Production Engineering and Safety, Czestochowa University of Technology, Poland

RADOMSKA K.

Department of Chemistry, Czestochowa University of Technology, Poland

The purpose of this work was to analyze the effect of the new binder (extender) on the behavior of the magnetic composite in acidified sulphate environment. In the studies the magnetic powder with chemical formula Nd12Fe77Co5B6 (lower indices denotes atomic %) and biopolymer of which polymerization processes is carried out in low temperatures have been used. On the basis of the presented potentiokinetic polarization curves and changes in polarization resistance, the most favorable, in terms of corrosion resistance, composition of the Nd-Fe-B/biopolymer magnetic composite has been selected.

Keywords: bonded RE-M-B magnets, magnetic composite, biopolymer, polymerization process

2017

Vol. 60, nr 11

pp. 372-375

Ref. 17

 

DOI: 10.15199/40.2017.11.5

Application of silane films in the corrosion protection of metals

OWCZAREK E.

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

Czestochowa University of Technology, Armii Krajowej Ave. 19, 42-200 Czestochowa, Poland

Silanes are one the most attractive materials among the possible alternatives to replace the toxic conventional Cr6+ base pretreatment technologies for corrosion protection of metals. Important advantages of silanes are competitive price, environmental friendliness and compatibility with wide range of inorganic and organic interfaces. In this paper the current status and perspectives in study of organofunctional silane films for the corrosion prevention and protection of metals have been  presented.

Keywords: silane, corrosion protection, metals

2017

Vol. 60, nr 11

pp. 376-379

Bibliogr. 79

 

DOI: 10.15199/40.2017.11.6

Testing protective properties of cover in reinforced silos for cement

SZWEDA Z.

Faculty of Civil Engineering, the Silesian University of Technology

Corrosion risk of cement silos was evaluated by testing protective properties of reinforcement steel cover against drilled concrete cores. Those tests were conducted to evaluate the carbonation progress in concrete and the effect of chlorides being the main reason for reinforcement corrosion.

Keywords: concrete carbonation, effect of chlorides, reinforcement corrosion, distribution of chloride concentrations

2017

Vol. 60, nr 11

pp. 380-383

Ref. 10