Journal ArticleDOI
Effect of nano‐particulate sol–gel coatings on the oxidation resistance of high‐strength steel alloys during the press‐hardening process
TLDR
In this paper, the nano-particulate thin coatings obtained by the sol-gel process to improve the oxidation resistance of 22MnB5 steel were investigated and the structural properties of the coating materials were characterized using different methods like XRD and differential thermal analysis.Abstract:
The need for lighter constructional materials in automotive industries has increased the use of high-strength steel alloys. To enhance passenger's safety press hardening may be applied to steel parts. However, as the steel parts are heated up to 950 °C during this process they have to be protected by some kind of coating against the intense oxide formation usually taking place. As the coating systems used so far all have certain disadvantages in this work the ability of nano-particulate thin coatings obtained by the sol–gel process to improve the oxidation resistance of 22MnB5 steel is investigated.
The coatings obtained from three sols containing lithium aluminum silicate and potassium aluminum silicate showed the best performance against oxidation. The structural properties of the coating materials were characterized using different methods like XRD and differential thermal analysis. Comparison of the oxidation rate constants proved the ability of the coatings to protect against oxidation at temperatures up to 800 °C. Press-hardening experiments in combination with investigations on the thermal shock resistance of the coated samples also showed the ability of the coatings to stay intact during press hardening with only slight spalling of the coatings in the bending areas. The absence of any secondary intermetallic phases and layer residues during laser beam welding experiments on coated samples proves the suitability of the nano-particulate coatings for further industrial processing.read more
Citations
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Journal ArticleDOI
Oxidation resistant silane coating for hot-dip galvanized hot stamping steel
TL;DR: In this paper, a silane coating was developed for hot-dip galvanized (HDG) steel via a solgel roll coating method and its oxidation resistance during austenitization was detailed.
Journal ArticleDOI
The Sacrificial Protection of Steel by Zinc-Containing Sol-Gel Coatings
TL;DR: In this article, the authors used the scanning vibrating electrode technique (SVET), electrochemical impedance spectroscopy, and salt spray testing to investigate the ability of Zn rich sol-gel coatings to provide sacrificial protection to carbon steel.
References
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Book
Sol-Gel Science: The Physics and Chemistry of Sol-Gel Processing
TL;DR: Gel-Derived and Conventional Ceramics: as discussed by the authors Theoretical analysis of deformation and flow in gels and a comparison of gel-derived and conventional ceramics.
Journal ArticleDOI
Sol–gel coatings on metals for corrosion protection
Duhua Wang,Gordon P. Bierwagen +1 more
TL;DR: In this article, a review of the recent developments and applications of sol-gel corrosion protection coatings on different metal substrates, such as steel, aluminum, copper, magnesium and their alloys, is presented.
Book
Corrosion and environmental degradation
TL;DR: Phenomenological and electrochemical fundamentals of corrosion fundamentals of high temperature corrosion passivity of metals and alloys microbial corrosion environment sensitive fracture corrosive wear and erosion advanced investigation techniques cathodic and anodic protection environmentally friendly inhibitors the effect of coatings and surface modification as discussed by the authors.
Journal ArticleDOI
Microstructure studies of an aluminide coating on 9Cr-1Mo steel during high temperature oxidation
TL;DR: The Kirkendall effect is a plausible mechanism for the voids observed at the interface between the aluminide layer and the steel substrate as mentioned in this paper, where FeAl 3, FeAl 5, and FeAl 2 initially formed on a steel substrate at elevated temperature.
Journal ArticleDOI
A Review of the Physical Metallurgy related to the Hot Press Forming of Advanced High Strength Steel
TL;DR: In this article, the physical metallurgy principles of the hot press forming process are reviewed and the effect of composition on CCT curves of standard CMnB hot-press forming steels is discussed taking the deformation during press forming into account.