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Modifying of REX 734 austenitic steel properties in the glow discharge processes combined with producing of carbon coatings

BOROWSKI T.

BROJANOWSKA A.
POPŁAWSKI K.
Politechnika Warszawska, Wydział Inżynierii Materiałowej
RAJCHEL B.
Polska Akademia Nauk, Instytut Fizyki Jądrowej im. Henryka Niewodniczańskiego,
Zakład Fizyki i Inżynierii Materiałowej, Kraków
ROŻNIATOWSKI K.
WIERZCHOŃ T.

Politechnika Warszawska, Wydział Inżynierii Materiałowej

Austenitic stainless steels are characterized by unsatisfactory hardness and pitting corrosion resistance in a physiological liquid environment. In order to modify REX 734 steel functional properties, such as corrosion resistance and frictional wear resistance, low-temperature (≤380°C) glow discharge nitriding and carbonitriding processes were applied in combination with the process of producing carbon coating in one technological cycle. The work presents the results of examinations of produced layers surface microstructure, their chemical and phase composition as well as examinations of their functional properties, such as hardness, frictional wear resistance and corrosion resistance. Application of glow discharge carbonitriding combined with producing of carbon coating in one technological process influenced the improvement of corrosion resistance in Ringer's solution and significantly increased wear resistance of austenitic stainless steel.
Keywords: austenitic steel, glow discharge treatment, carbon coating, corrosion resistance, frictional wear resistance

2012
Vol.. 55, nr 12
s. 558-563
Ref. 13

Influence of heat treatment of ZnAl22Cu3 zinc alloy on corrosion resistance in 3% NaCl

MICHALIK R.
WOŹNICA H.

Wydział Inżynierii Materiałowej i Metalurgii, Politechnika Śląska

The purpose of this examination was to determine the influence of heat treatment on ZnAl22Cu3 alloy corrosion resistance in the 3% NaCl solution. The subject of examination was unmodified ZnAl33Cu3 alloy. The tested alloy was: heated at the temperature of 185oC during10 hours with cooling in water, heated at the temperature of 380oC during 10 hours with cooling in water and heated at the temperature of 385oC for 10 hours followed by heating at the temperature of 175oC with cooling in the water. Potentiodynamic and potentiostatic tests were carried out in the 3% NaCl solution.
After corrosion tests examination of the surface of the samples were conducted. Examinations have shown that the highest corrosion resistance is characterized by an alloy after heating at the temperature of 385oC/10h and the lowest after heating at
185oC/10 h.
Keywords: Zn-Al-Cu alloys, corrosion resistance, structure, heat treatment

2012
Vol.. 55, nr 12
s. 564-567
Ref. 12

Corrosion surveys on selected failures. Part 2: Powder coatings and coating systems on tanks and bridges

KRÓLIKOWSKA A.
AUGUSTYŃSKI Ł.
KOMOROWSKI L.
Instytut Badawczy Dróg i Mostów, Warszawa

Selected failures involving three corrosion protection systems i.e. hot dip galvanized zinc coatings and duplex systems, powder coatings and coating systems for steel tanks and bridges have been discussed.
Keywords: hot dip zinc coatings, coatings systems, powder coatings

2012
Vol.. 55, nr 12
s. 568-571
Ref. 5

Ochrona przed korozją w praktyce - Obscure origins of corrosion consciousness

KRÓLIKOWSKI A.
Politechnika Warszawska, Wydział Chemiczny

The corrosion consciousness is based of the knowledge taken from high school and university educations as well as information extracted from mass media. Graduates from several courses in technical universities acquire, or at least should acquire, basic information on corrosion and corrosion protection. However, the university courses do not offer specialistic knowledge on corrosion. Prospective corrosion engineers acquire this knowledge by the continuing education (post-diploma courses, workshops, trainings, apprenticeships at skilled professionals). Textbooks devoted to corrosion are also useful. However, some inconsistencies, concerning corrosion issues, occur in popular textbooks. Examples of such inconsistencies and resulting misunderstandings were shown. Some awkward pieces of information about corrosion issues, disseminated in mass media, were also indicated.
Keywords: corrosion, corrosion protection, education, knowledge, consciousness

2012
Vol.. 55, nr 12
s. 572-575
Ref. 36