<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The paper studies corrosion of selected Pb-Sn-Sb alloys
in soil. Corrosion tests were proposed and performed based
on the survey of the mechanism of corrosion of archaeological
objects – letter types. The composition of tested lead alloys
corresponds to the phases in structures of alloys the original
types were made from. Three types of soil with different pH
were selected as the corrosion environment and one of the set
of specimens was exposed additionally to acetic acid vapours
to monitor the impact of volatile organic compounds. The results
were compared with similar corrosion tests performed at
the University of Antwerp. The results implied that it was predominantly
the character of the microstructure the lead alloys
form that affects corrosion of Pb–Sn–Sb alloys. Intermetallic
phases SnSb are formed within the lead matrix, the average
composition of which corresponds to 55 % of Sn and 45 %
of Sb. The SnSb phase is very hard and resistant; a corrosion
microcell is formed when in contact with the matrix, with the
lead matrix being preferentially susceptible to corrosion. The
content of antimony and tin in the alloy affects formation and
the quantity of the SnSb phase.</abstract>

The study on corrosion of Pb–Sn–Sb alloys in soil

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">This article presents the program of experimental atmospheric
corrosion test of weathering steels. This program
is designed as a long-term project. Attention is paid to study
of corrosion processes at different structural elements of
supporting structures of bridges. Measurements of corrosion
losses and average thicknesses of corrosion products are carried
out within this experimental program. Protective ability
of corrosion products is evaluated using X-ray diffraction
analysis. The article presents results of corrosion tests after
one year of exposure of corrosion specimens. It results from the
tests that corrosion losses of weathering steels are signifi cantly
conditioned by position and location of exposed surface within
the structure.</abstract>

Program of experimental atmospheric corrosion tests of weathering steels

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The ex-situ tests were performed with Zr1Nb alloy specimens
that had been pre-exposed to the environment with an
elevated concentration of lithium (70 ppm Li as LiOH) at the
temperature of 360 °C for a period of 63 to 77 days prior to
the measurement. The impedance changes at the phase alloy-
-oxide-electrolyte interface were monitored using the ex-situ
electrochemical impedance spectroscopy. At the same time, the
progress of electrolyte penetration in the oxide porous structure
was studied. The oxidic layer and the electrolyte penetration
are characterized by the elements of the equivalent circuit
model and Jonscher analysis that enables calculation of the
dielectric thickness of the oxide.</abstract>

Ex-situ characterization of pre- and post-transient specimens of Zr1Nb alloys

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">Compared to the traditional inorganic binders based on
mortar or plaster, cementing clefts and cracks with polymer
fl exible binders is effective in terms of better adhesion and fl exibility.
Nevertheless, in order to be applicable in restoration
practice they must comply with the condition of a minimum impact
on the substrate, which frequently is a porous material.
Silicon-based binders, synthetic rubber and hybrid binders based
on silicone modifi ed with polyurethane and polyether were
tested in this study. The binders were artifi cially aged under
various conditions. At the same time, the study also focused on
the extent of infl uencing of the porous cement substrate by the
application of binders. The silicone binders showed the best
resistance to artifi cial aging, however, the originally hydrophilic
substrate became hydrophobic. Hybrid binders showed better
resistance to moist rather than dry atmosphere. Testing in
the QUV panel caused cracking and incoherence of all hybrid
bonders. Various categories of binders showed similar properties
in terms of resistance to aging and the extent of infl uencing
of the porous substrate. The porous cement substrate was
reported to be substantially infl uenced by all tested binders.
Therefore, none of the tested binders can be unambiguously
recommended for application in restoration practice.</abstract>

Ústav chemické technologie restaurování památek, VŠCHT Praha

Flexible binders, their degradation and impact on cement substrate

<abstract xml:lang="en" xmlns="http://www.w3.org/1999/xhtml">The paper deals with corrosion degradation of gas pipeline.
Pipelines play very important role as means transporting
gas media over long distances from producers to end-users.
Gas pipelines present a risk of potential corrosion degradation
that can result in their failure. Corrosion on internal surfaces
of steel pipes takes place in CO2, H2S, H2O and chloride environment.
Degradation of steel results in loss of mechanical
properties, reduction in thickness and ultimate perforation and
failure. Corrosion is the electrochemical process that involves
the fl ow of electrical currents on a micro or macro scale. For
corroding steel, the anodic and the cathodic reactions produces
the electrochemical cell. Corrosion protection of internal
pipeline surface is based mainly on chemical composition of
gas and the use of inhibitors. Corrosion protection of the external
steel surface of the product line involves coatings and
cathodic protection.</abstract>

Technical University of Košice, Department of Materials Science

Selected types of corrosion degradation of pipelines

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KOM – Corrosion and Material Protection Journal

The journal is primarily focused on corrosion engineering and surface treatment of metallic materials. We accept also articles concerning degradation of paints, enamels and other non-metallic materials used for corrosion prevention of metals. Another field of interest is conservation and restoration of cultural heritage. In this case we accept contributions concerning all materials (metals, wood, paper, leather, textiles, stone, glass and ceramics).  Why subscribe and read   Official Journal of the Association of Czech and Slovak Corrosion Engineers, premier source of high quality research results from all over the world with special emphasis on Central and Eastern Europe;  over 55 years of experience in publishing original papers dealing with corrosion science, engineering and technology;  focused on research in corrosion and surface treatment as well as experiences in practice and „case studies“;  original papers that advance understanding of both the fundamentals of corrosion and its application;  excellent articles authored by researchers from all over the world, who appreciate our fast, fair and constructive peer review provided by experts in the field of corrosion engineering.   Why submit   Fast, fair and constructive peer review  Fast publication process („submission→published article“ takes usually 3-6 months)  High quality electronic publication technologies  Open access (simple and charge-free access for every researcher)   Rejection Rate   10%   Archiving  Sciendo archives the contents of this journal in Portico - digital long-term preservation service of scholarly books, journals and collections.  Plagiarism Policy  The editorial board is participating in a growing community of Similarity Check System's users in order to ensure that the content published is original and trustworthy. Similarity Check is a medium that allows for comprehensive manuscripts screening, aimed to eliminate plagiarism and provide a high standard and quality peer-review process. 