29074
2013
eng
714
722
8
64
article
Wiley-VCH Verl.
Weinheim
Gesellschaft für Korrosionsschutz
1
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Short and long term degradation behaviour of Mg-1Ca magnesium alloys and protective coatings based on plasma-chemical oxidation and biodegradable polymer coating in synthetic body fluid
The main problem limiting the application of magnesium alloys as biodegradable implant material is its high degradation rate. In order to slow down the corrosion rate an extrusion process and specific coating systems based on plasma-chemical oxidation (PCO) and organic dip coating with poly(ʟ-lactid-co-caprolacton) (PLLC) were applied on Mg–1Ca magnesium alloy. The additional PLLC coating is used to delay the start of substrate corrosion, while the purpose of the PCO coating is to decrease the substrate corrosion rate. The corrosion behaviour was investigated in synthetic body fluid (SBF) through measurement of the hydrogen evolution rate in long term tests and polarisation and electrochemical noise measurements in short term tests. The results showed significant differences between the cast and extruded alloys and a decrease of the corrosion rate due to corrosion product formation. The combination of both coating systems resulted in a significant delay of metal substrate corrosion and all coating systems showed good correlation between short and long term tests. The combination of the three investigation methods provides the possibility to gain more information about the degradation behaviour and break down of protective coatings.
Materials and corrosion
31974
10.1002/maco.201206590
0947-5117
1521-4176
Sonderstandort: Publica-Schrank
16.09.2013
P. Rosemann
J. Schmidt
Andreas Heyn
eng
uncontrolled
Coatings
eng
uncontrolled
Corrosion
eng
uncontrolled
Electrochemical noise
eng
uncontrolled
Magnesium
eng
uncontrolled
Plasma-chemical oxidation
Verlagsliteratur
Physisches Exemplar in der Bibliothek der BAM vorhanden ("Hardcopy Access")
32572
2015
eng
45
53
1
66
article
Wiley-VCH Verl.
Weinheim
Gesellschaft für Korrosionsschutz
1
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Influence of microstructure and surface treatment on the corrosion resistance of martensic stainless steels 1.4116, 1.4034, and 1.4021
In the last years, new approaches for the evaluation of the corrosion resistance of martensitic stainless steels were developed, which allow nearly non-destructive as well as short-term corrosion testing. This work analyzes the sensitive influence of microstructure and surface treatment on the corrosion resistance. The effect of alloy composition and microstructure, which is always present in addition to the influence of various surface treatments will be evaluated and discussed. The corrosion behavior was investigated with conventional evaluation of the pitting potential, electrochemical potentiodynamic reactivation (EPR), electrochemical noise (EN), and the 'KorroPad' (KP) technique. EPR provided information about the passivation ability and the extent of chromium content reduction due to chromium carbide precipitation in the microstructure. The use of EN and KP aims to detect the influence of different surface treatment parameters on the corrosion resistance in a nearly non-destructive way. Furthermore the results shall demonstrate the functionality and convenience of the short-term corrosion test methods EN and KP in order to gain more acceptance within the scientific community. The results will allow the extraction of surface treatment effects on the corrosion behavior of the martensitic stainless steels 1.4116, 1.4034, and 1.4021.
Materials and corrosion
35643
10.1002/maco.201307276
0947-5117
1521-4176
18.02.2015
P. Rosemann
Thoralf Müller
Martin Babutzka
Andreas Heyn
eng
uncontrolled
Corrosion resistance
eng
uncontrolled
Electrochemical noise
eng
uncontrolled
Martensitic stainless steel
eng
uncontrolled
Electrochemical potentiodynamic reactivation
eng
uncontrolled
KorroPad
deu
uncontrolled
EPR-Test
eng
uncontrolled
Heat treatment
Verlagsliteratur
Datei im Netzwerk der BAM verfügbar ("Closed Access")