Influence of Alloy Composition and Processing on the Nodular Corrosion Resistance of Zircaloy-2

2009 ◽  
pp. 304-304-12 ◽  
Author(s):  
ER Bradley ◽  
JH Schemel ◽  
A-L Nystöm
Keyword(s):  
Corrosion Resistance ◽  
Alloy Composition

The Effect of Composition and Microstructure on Corrosion Behavior in SST of Zn-Al-Mg Galvanized Steel Sheet

2013 ◽  
Vol 442 ◽  
pp. 64-69
Author(s):  
Feng Li ◽  
Jia Shun Lv ◽  
Hong Gang Yang ◽  
Fang Zhou ◽  
Leng Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
Steel Sheet ◽  
Alloy Composition ◽  
Element Distribution ◽  
Galvanized Steel ◽  
Good Corrosion Resistance ◽  
Excellent Corrosion Resistance

Z11A3M, Z6A3M, Z1.6A1.6M, Z1A1M and Z1M coating samples were prepared in HDPS by traditional continuous hot dipping method. The microstructure, element distribution and phase was analyzed by SEM, EPMA and XRD. The corrosion resistance was checked in SST. The result was, MgZn2 and eutectic could be found in all ZAM coating. The ZAM coatings showed excellent corrosion resistance in SST than GI. The corrosion resistance was 4.1 to 11 times of GI. There was no strong relativity between alloy composition and corrosion resistance due to Mg enrichment on the surface of coating. Edge-unsealed ZAM samples showed good corrosion resistance than edge-sealed sample.

Corrosion of Cobalt and Cobalt Alloys

CORROSION ◽  
1969 ◽  
Vol 25 (7) ◽  
pp. 307-322 ◽  
Author(s):  
F. R. MORRAL
Keyword(s):  
Crystal Structure ◽  
Corrosion Resistance ◽  
Alloy Composition ◽  
Surface Preparation ◽  
Cobalt Alloys ◽  
Effect Data ◽  
Corrosion Rates ◽  
Effect Of Impurities ◽  
Cobalt Base

Abstract Investigations are reviewed of the composition and structures of corrosion films and scales found on cobalt and on simple and complex cobalt-base industrial alloys. The corrosion resistance of these films and scales depends on metal and alloy composition, environment (an atmosphere containing one or more of CO2, S, H2S, O2, H2O, SO2, V2O3, NaCl, etc.), pressure, temperature, and time. Additional factors, alone or in combination, such as surface preparation, stress, thermal shock, geometry of the part, velocity, density, and flow pattern of the corroding environment also have an effect. Data on oxidation, sulfidation, and hot corrosion (a combination of the first two) of cobalt and its alloys are summarized in some detail, as are the known characteristics of the films and scales that are formed. Only the work that used techniques permitting determination of composition and crystal structure of these films and scales was reviewed. The effect of impurities in metals and alloys may be as significant as that of added alloying elements; impurities may alter the scales' chemical and physical properties—increasing, decreasing, or neutralizing corrosion rates. Until data are available on the intereffect on diffusion of elements present in scales, films, and metal surfaces, the mechanisms of corrosion proposed are only hypotheses.

A Comparative Study on the Oxidation of Fe-25Cr-7Ni-4Mo and Fe-25Cr-7Ni-2Mo-4W Steels

2014 ◽  
Vol 620 ◽  
pp. 453-456
Author(s):  
Shun Myung Shin ◽  
Jei Pil Wang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Comparative Study ◽  
Oxide Layer ◽  
Alloy Composition ◽  
Ion Diffusion ◽  
Wide Range ◽  
Steel Grades ◽  
Corrosive Environments

Stainless steel materials (FeCr and FeCrNi-based alloys) are employed in a wide range of modern applications due to their ability to withstand corrosive environments while maintaining good mechanical properties. Their corrosion resistance originates from Cr-rich oxide layer which serves as a barrier against ion diffusion between the alloy and the ambient phase. Custom steel grades can be designed for specific applications by optimizing their properties throughout alloy composition [1].

scholarly journals Crevice corrosion

2019 ◽  
Author(s):  
Mariano Iannuzzi ◽  
Mobin Salasi ◽  
Edgar Hornus
Keyword(s):  
Quality Control ◽  
Corrosion Resistance ◽  
Stainless Steels ◽  
Crevice Corrosion ◽  
Alloy Composition ◽  
Test Methods ◽  
Standard Test ◽  
Critical Temperatures ◽  
Alloy Systems

Today, there is a large number of accepted tests to study crevice corrosion phenomena. The different methodologies can be used for comparing and ranking alloys, quality control, assessing the effects of changes in manufacturing routes and alloy composition on crevice corrosion resistance, as well as in evaluations to determine critical temperatures and potentials and induction times.The goal of the chapter is to describe the various standard test methods available to the corrosion specialist as well as adaptations to study specific crevice corrosion parameters. The focus is on test methods developed by the ASTM Committee G-1 on corrosion of metals, but other procedures are also included. While the test principles have been applied to many alloy systems, the scope of the chapter is on stainless steels and nickel-based alloys.

An electrochemical method based on OCP fluctuations for anti-corrosion alloy composition optimization

2018 ◽  
Vol 65 (3) ◽  
pp. 325-330 ◽  
Author(s):  
Mindong Chen ◽  
Huijie Zhang ◽  
Liang Chen ◽  
Dongmei Fu
Keyword(s):  
Corrosion Resistance ◽  
Electrochemical Method ◽  
Alloy Composition ◽  
Open Circuit ◽  
Carbon Steels ◽  
Rust Layer ◽  
Content Type ◽  
Potential Fluctuations ◽  
Composition Optimization

Purpose An electrochemical method based on the open circuit potential (OCP) fluctuations was put forward. It can be used to optimize the alloy compositions for improving the corrosion resistance of rust layer. Design/methodology/approach The potential trends and potential fluctuations of carbon steels in seawater were separated by Hodrick–Prescott filter. The Spearman correlation coefficient and max information coefficient were used to explore the correlation of alloy compositions and potential fluctuations. Findings After long-term immersion, potential fluctuation resistance (PFR) can be used to characterize the corrosion resistance of metals and its rust layers. In the 1,500 to 2,500 h exposure period, Fe, C and S compositions have strong negative correlations, whereas PFR and P composition have weak negative correlations. Mn, Cu and Ti alloy compositions help the rust layer of carbon steels have higher PFRs. These elements that exhibit higher PFRs in this period have been confirmed to have the effect on improving the corrosion resistance of rust layer. Originality/value A new computing method for alloy composition optimization of carbon steels based on the OCP fluctuations was put forward. This method combines electrochemical monitoring with the long-term actual seawater environmental tests of various carbon steels.

Recent Development of Highly Corrosion Resistant Bulk Glassy Alloys

2005 ◽  
Vol 502 ◽  
pp. 225-230 ◽  
Author(s):  
Katsuhiko Asami ◽  
H. Habazaki ◽  
Akihisa Inoue ◽  
Koji Hashimoto
Keyword(s):  
Corrosion Resistance ◽  
Passive Film ◽  
Amorphous Alloys ◽  
Alloy Composition ◽  
Amorphous Structure ◽  
Glass Forming Ability ◽  
Corrosion Resistant ◽  
Glass Forming ◽  
Glassy Alloys

Recent development of corrosion resistant bulk glassy alloys such as Zr-, Fe-, Ni- and Cu-base alloys were presented. It was clarified that the enrichment of cations in the passive film, which is responsible to corrosion resistance, depends on both alloy composition and environment. TEM observation also made it clear that alloys lose their advantageous properties such as corrosion resistance when they are devoid of or lose amorphous structure even in part due to low glass forming ability or heating. These findings were essentially similar to those of conventional amorphous alloys.

Corrosion Behavior of Rapidly Solidified Fe-Ti-P Alloys With Cu, Cr, and B Additions

1983 ◽  
Vol 28 ◽  
Author(s):  
C. R. Shastry ◽  
R. M. Latanision ◽  
H. E. Townsend
Keyword(s):  
Corrosion Resistance ◽  
Melt Spinning ◽  
Anodic Polarization ◽  
Alloy Composition ◽  
Amorphous Structure ◽  
Degree Of Crystallinity ◽  
X Ray Diffraction ◽  
X Ray ◽  
B Additions ◽  
Rapidly Solidified

ABSTRACTRapidly solidified ribbons of Fe67Ti13P(20-x)Bx (x= 0, 7, 20 a/o) and Fe(85-y)Ti l5Py (y=5, 10 a/o) alloys were produced by melt spinning, and their structure and anodic polarization behavior were examined by x-ray diffraction and potentio-dynamic polarization measurements in deaerated 1 N H2SO4, respectively. The only alloy that developed an amorphous structure on rapid solidification, Fe67Ti13B20, exhibited poor corrosion resistance, whereas crystalline alloys with 10 a/o or more P exhibited a tendency to passivate during anodic polarization. Substituting Cr for Ti led to significant improvement in corrosion resistance and promoted development of glassy structures in Fe67(TiCr)13P13B7 compositions. No such improvements were observed when Cu was substituted for Ti. It is concluded that alloy composition is more important than degree of crystallinity in determining corrosion resistance.

Chemical partitioning of elements in Ni-base MC-carbide reinforced eutetic superalloys

1983 ◽  
Vol 41 ◽  
pp. 250-251
Author(s):  
E. F. Koch ◽  
E. L. Hall ◽  
S. W. Yang
Keyword(s):  
Alloy Composition ◽  
Volume Fraction ◽  
Lattice Mismatch ◽  
Turbine Blades ◽  
Eutectic Alloys ◽  
Alloy Matrix ◽  
X Ray ◽  
Gas Turbine Blades ◽  
Analytical Electron ◽  
Analytical Electron Microscope

The plane-front solidified eutectic alloys consisting of aligned tantalum monocarbide fibers in a nickel alloy matrix are currently under consideration for future aircraft and gas turbine blades. The MC fibers provide exceptional strength at high temperatures. In these alloys, the Ni matrix is strengthened by the precipitation of the coherent γ' phase (ordered L12 structure, nominally Ni3Al). The mechanical strength of these materials can be sensitively affected by overall alloy composition, and these strength variations can be due to several factors, including changes in solid solution strength of the γ matrix, changes in they γ' size or morphology, changes in the γ-γ' lattice mismatch or interfacial energy, or changes in the MC morphology, volume fraction, thermal stability, and stoichiometry. In order to differentiate between these various mechanisms, it is necessary to determine the partitioning of elemental additions between the γ,γ', and MC phases. This paper describes the results of such a study using energy dispersive X-ray spectroscopy in the analytical electron microscope.

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