Application of Hyperspectral Analysis for Evaluation of Corrosion Resistance of Steel Materials under Atmospheric Environment

2021 ◽  
Vol 70 (11) ◽  
pp. 354-357
Author(s):  
Ryo Kobayashi ◽  
Hideki Katayama ◽  
Takaya Akashi
Keyword(s):  
Corrosion Resistance ◽  
Atmospheric Environment

scholarly journals Corrosion Behavior of Corrosion-Resistant Spring Steel Used in High Speed Railway

2021 ◽  
Vol 11 (18) ◽  
pp. 8668
Author(s):  
Jinbo Li ◽  
Ziying Zhu ◽  
Hongwei Chen ◽  
Shaojie Li ◽  
Hongyan Wu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Behavior ◽  
High Speed ◽  
Corrosion Potential ◽  
Early Stage ◽  
Corrosion Current ◽  
Corrosion Products ◽  
Atmospheric Environment ◽  
Rust Layer ◽  
Experimental Steel

Corrosion behavior of 60Si2Mn-A and 60Si2Mn-B in simulated industrial atmospheric environment was investigated by alternate immersion corrosion test and electrochemical method. The phase, morphology, characteristics of corrosion products, and the distribution of Cr, Cu, and Ni in the corrosion products of experimental steel were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM), and electron probe microanalyzer (EPMA). The results show that the phase of rust layer is Fe3O4 and γ-FeOOH in the early stage and then changes to α-FeOOH and γ-FeOOH in the later stage; the size of the rust layer with corrosion resistance of 60Si2Mn is less than 60Si2Mn; the Cr element accumulates in the rust layer of the experimental steel in the early stage of corrosion resistance; and Cu, Ni, and Cr in the corrosion resistance 60Si2Mn are concentrated in the rust layer near the substrate In the later stage of corrosion. As the corrosion cycle is prolonged, the corrosion potential and the resistance of the rust layer of the experimental steel increases, and the corrosion current decreases; in the same corrosion cycle, the corrosion potential and corrosion resistance of 60Si2Mn-B are greater than 60Si2Mn, and the corrosion current is less than 60Si2Mn.

Effect of Ni Content on the Initial Corrosion Resistance of Steel in Atmospheric Environment

2020 ◽  
Vol MA2020-02 (13) ◽  
pp. 1315-1315
Author(s):  
Kota Kiyoizumi ◽  
Yuichi Ono ◽  
Hideki Katayama ◽  
Yoshinao Hoshi ◽  
Hikari Watanabe ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Atmospheric Environment ◽  
Ni Content

Investigation of the Corrosion Resistance of Weathering Steel at Different Atmospheric Environment

2012 ◽  
Vol 629 ◽  
pp. 240-244
Author(s):  
Zhi Fen Wang ◽  
Jian Rong Liu ◽  
Li Xin Wu ◽  
Yi Qiang Sun ◽  
Rong Dong Han
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Atmospheric Corrosion ◽  
Atmospheric Environment ◽  
Weathering Steel ◽  
Rust Layer ◽  
Corrosion Rates ◽  
Two Cities ◽  
Environment Factor

The corrosion resistances of a weathering steel SPA-H and a carbon steel Q345 after atmospheric corrosion rests of two cities were measured. The results showed that the corrosion resistance was better for SPA-H than Q345 based on the corrosion rate. The corrosion rates of two steels at Qionghai city were lower than those of Jiangjin city. The characterization of the rusts showed the rust layer on SPA-H was denser and thinner than that of Q345. The rust layers were mainly composed of goethite (α-FeOOH) with a few of lepidocrocite (γ-FeOOH). SPA-H had better weatherability attributed to the alloying elements of copper, chromium and phosphorus enriched in the rust layer. The environment factor such as the sedimentation of SO2 has more effect on the corrosion rates than other factors such as alloy elements.

An accelerated testing method for the evaluation of atmospheric corrosion resistance of weathering steels

2015 ◽  
Vol 62 (2) ◽  
pp. 77-82 ◽  
Author(s):  
Yuhai Qian ◽  
Jingjun Xu ◽  
Meishuan Li
Keyword(s):  
Corrosion Resistance ◽  
Atmospheric Corrosion ◽  
Test Methods ◽  
Test Method ◽  
Atmospheric Environment ◽  
Weathering Steel ◽  
Content Type ◽  
Dry Process ◽  
Immersion Medium ◽  
Short Period

Purpose – The purpose of this paper is to present a laboratory accelerated periodic immersion wet/dry cyclic corrosion test, reflecting the alternate wet/dry process during the atmospheric exposure of metallic materials, which can be applied to evaluate the atmospheric corrosion resistance (ACR) of weathering steels in a very short period. Design/methodology/approach – This test method uses 0.01 M sodium bisulfite aqueous solution with pH 4.4 as the immersion medium, simulating the notable characteristics of sulfur dioxide pollutant in industrially polluted atmospheres. During the test process, the tested specimens are immersed into the solution for 12 minutes, immediately followed by the subsequent drying process for 48 minutes, and such alternate process consists of a cyclic period, i.e. 1 hour. As a result of this procedure, a relative corrosion rate is defined to determine the ACR. To determine a preferred test period, different test periods including 72 and 200 hours were compared. Findings – Compared with several other commonly used test methods, it was confirmed that the relative ACR of various steels can be determined after testing for only 72 hours. The constituent of the corrosion products, i.e. the rust layer, was consistent with that formed after long-term exposure in a typical outdoor atmospheric environment. Originality/value – The test method enables comparative testing for ranking the ACR of weathering steel during the development of new weathering steels.

Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

1975 ◽  
Vol 33 ◽  
pp. 54-55
Author(s):  
Anna C. Fraker
Keyword(s):  
Corrosion Resistance ◽  
Beneficial Effect ◽  
Crevice Corrosion ◽  
Local Corrosion ◽  
Precipitate Size ◽  
Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

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