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Ochrona przed Korozją” (Corrosion Protection) No 08/2017

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

 

 

„Ochrona przed Korozją”

nr 8/2017

DOI: 10.15199/40.2017.8.1

Effect of pitting corrosion on evaluation of cathodic protectionefficiency by the electric resistance method

JANKOWSKI J.

SPZP CORRPOL Sp. z o.o., Gdańsk

The electric resistance method is becoming increasingly widespread for evaluation of the cathodic protection effectiveness of steel underground structures. This sensitive measuring technique allows precise determination of the corrosion rate of a metal, assuming that corrosion is uniform and results in a uniform reduction in the cross-section of the ER probe sensing element over its entire length. In the case of non-uniform corrosion, significant errors in corrosion rate measurements may be expected. This paper presents the results of computer simulations showing howpitting corrosion can affect the results of resistance measurements. The influence of model pits of circular cross-section on resistance measurements was determined, and thus, the linear corrosion losses, accountingfor the number of pits, their diameter and depth.

Keywords: cathodic protection, pitting corrosion, electric resistance method

2017

Vol. 60, nr 8

pp.241-245

Ref. 11

 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2017.8.2

Remote monitoring of pipeline cathodic protection system

ROZWADOWSKI J.

SPZP CORRPOL Sp. z o.o., Gdańsk

MALICKI M.

Speckor

In this paper the implementation of remote monitoring system of pipeline cathodic protection installation is described. In the introduction, the most important information about the pipeline regarding to corrosion protection is given and the sources of potential corrosion hazard are being discussed. The installation of cathodic protection and the installation of telemetry devices are subsequently described. The most relevant configuration parameters of the devices and their functionality are also presented. Finally, the implemented system for measurement data collection, processing and visualization is described.

Keywords: telemetry, monitoring, remote measurements, cathodic protection

2017

Vol. 60, nr 8

pp. 246-249

 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2017.8.3

Flawless insulation coatings of underground pipelines

FIEDOROWICZ M.

Operator Gazociągów Przesyłowych GAZ-SYSTEM S.A. Oddział w Gdańsku

Corrosion protection of selected areas of underground pipelines is based on flawless insulation coatings more and more often these days. In this work, the definition and criteria of the flawlessness of coating will be considered. The right criterion of flawnessness is essential for the effectiveness of this kind of anticorrosion protection.

Keywords: insulation coating, coating defect, average coating resistance (average structure to soil resistance)

2017

Vol. 60, nr 8

pp.250-254

Ref. 22

 

DOI: 10.15199/40.2017.8.4

Effects of measured electrical impedance of reciprocally arrangedcounter electrode and rebar as the working electrode in synthetic concrete pore solution

PAMUŁA M.

JAŚNIOK M.

Department of Building Structures, Silesian University of Technology

This paper presents the analysis of real measuring situations which can occur while conducting diagnostic tests on corrosion rate of steel reinforcement in a concrete structure. For the purpose of this research, concrete was modelled with synthetic pore solution with pH = 13.4 to avoid the impact of non-homogeneous structure of concrete on test results. Measurements were performed by electrochemical impedance spectroscopy in a three-electrode setup. A working electrode was a steel rebar with a diameter of 22 mm, made of steel grade RB500. A counter electrode was made of stainless steel, and Cl–/AgCl,Ag electrode was used as a reference electrode. The tests included five unsymmetrical arrangements of the counter electrode and the reference electrode against the working electrode. Three different distances between the tested rebar and the counter electrode and three different widths of the counter electrode were assumed as additional variable parameters of the setup. The analysed results indicated a very significant effect of the relative displacement between the working electrode and the counter electrode on shapes of impedance spectra. Variability of other two geometrical parameters seemed to be less important.

Keywords: concrete structures, reinforced concrete, corrosion, reinforcement, concrete pore water, polarization tests, corrosion diagnostics, impedance spectroscopy, EIS

2017

Vol. 60, nr 8

pp.255-261

Ref. 17

 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2017.8.5

Role of the Polish Electrochemical Protection Committee against Corrosion in the Association

of Polish Electricians in the development of cathodic protection technology in Poland

SOKÓLSKI W.

Polski Komitet Elektrochemicznej Ochrony przed Korozją SEP

2017

Vol. 60, nr 8

pp.262-267

Ref.  51

 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2017.8.6

Some aspects of the measurements of undreground pipeline to soil resistance – Part II

FIEDOROWICZ M.

JAGIEŁŁO M.

Operator Gazociągów Przesyłowych GAZ-SYSTEM S.A. Oddział w Gdańsku

Spread resistance measurement is one of the most significant ways to assess cathodic protection of buried steel pipelines. This paper covers measuring problems of spread resistance of galvanically isolated pipelines, covered with no-defect or almost no-defect high quality coatings. One of the problems is the electric capacitance which such a pipeline represents. Both, such capacitance and high spread resistance of the pipeline, result in high time constant. This paper is to help the cathodic protection staff to upgrade to the 2nd competence level.

Keywords: coating, coated pipeline, cathodic protection, spread resistance, buried coated pipeline electric capacitance

2017

Vol. 60, nr 8

pp.268-271

Ref. 2

 

CORROSION PROTECTION IN PRACTICE

DOI: 10.15199/40.2017.8.7

Danish experience in cathodic protection of reinforced concrete structures

KLINGHOFFER O.

PAUL CHESS P.

FORCE Technology Headquarter

2017

Vol. 60, nr 8

pp.272-274

Ref. 3