Deciphering the formation mechanism of a protective corrosion product layer from electrochemical and natural corrosion behaviors of a nanocrystalline zinc coating

RSC Advances ◽  
2015 ◽  
Vol 5 (41) ◽  
pp. 32479-32490 ◽  
Author(s):  
Qingyang Li ◽  
Zhongbao Feng ◽  
Lihua Liu ◽  
Hong Xu ◽  
Wang Ge ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Formation Mechanism ◽  
Zinc Coating ◽  
Product Layer ◽  
Corrosion Product Film ◽  
Corrosion Product Layer ◽  
Product Film ◽  
Corrosion Behaviors ◽  
Natural Corrosion

A hydrophobic protective corrosion product film (NC-1) with a nano-wire structure is formed on the surface of a nanocrystalline zinc coating.

A Case Study on Inner Corrosion of 3%Cr Casing Steel in the CO2 Environments

2017 ◽  
Vol 872 ◽  
pp. 38-42
Author(s):  
Lin Xu ◽  
Si Yang Li ◽  
Ming Biao Xu
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Corrosion Product ◽  
Product Layer ◽  
Sem Analysis ◽  
Corrosion Property ◽  
Economic Exploitation ◽  
Corrosion Reaction ◽  
Corrosion Product Layer ◽  
Corrosion Behaviors

Understanding inner corrosion property of casing steel is fundamental to safe and economic exploitation of oil & gas. In this present work, a series of corrosion tests were conducted on 3%Cr coupons derived from 9-5/8” casing. Analyses of weight loss, product morphology and composition were carried out, to investigate the corrosion behaviors caused by sweet CO2. Analysis on the weight loss showed that, with an increment of temperature from 45°C to 105°C, the corrosion rate of 3%Cr coupon firstly ascends and then arrives to the maximum at 65°C. SEM analysis demonstrated the formation of a compact corrosion product layer on the specimen surface. While increasing the exposed time increases, the corrosion rate gradually descends. The main compositions of corrosion product are Fe-Cr and Cr5O12, which can effective hinder corrosion reaction in the CO2 environment.

scholarly journals Effect of Weld and Surface Defects on the Corrosion Behavior of Nickel Aluminum Bronze in 3.5% NaCl Solution

Metals ◽  
2020 ◽  
Vol 10 (9) ◽  
pp. 1227
Author(s):  
Xu Zhao ◽  
Yuhong Qi ◽  
Jintao Wang ◽  
Tianxiang Peng ◽  
Zhanping Zhang ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Corrosion Behavior ◽  
Early Stage ◽  
Optical Microscope ◽  
Aluminum Bronze ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Corrosion Product Film ◽  
Product Film ◽  
Nickel Aluminum Bronze

To study the effect of weld and defects on the corrosion behavior of nickel aluminum bronze (UNS C95810) in 3.5% NaCl solution, the weight loss, X-ray diffraction, optical microscope, scanning electron microscope and electrochemical test of the specimen with weld and defects were investigated. The results show that the presence of weld and defects increases the corrosion rate of bronze. Weld does not change the structure of the corrosion product film, but defects induce a lack of the protective outermost corrosion product in bronze. Weld makes the corrosion product film in the early stage more porous. Defects always produce an increase in the dissolution rate of the bronze.

scholarly journals Evolution of the Corrosion Product Film on Nickel-Aluminum Bronze and Its Corrosion Behavior in 3.5 wt % NaCl Solution

Materials ◽  
2019 ◽  
Vol 12 (2) ◽  
pp. 209 ◽  
Author(s):  
Yang Ding ◽  
Rong Zhao ◽  
Zhenbo Qin ◽  
Zhong Wu ◽  
Liqiang Wang ◽  
...  
Keyword(s):  
Corrosion Product ◽  
Aluminum Bronze ◽  
Protective Film ◽  
Nickel Aluminum ◽  
Nacl Solution ◽  
Corrosion Attack ◽  
Corrosion Product Film ◽  
Product Film ◽  
Nickel Aluminum Bronze

The in-situ studies of the corrosion product film on nickel-aluminum bronze are significant for explaining the mechanism of its corrosion resistance. In this paper, the corrosion behavior of nickel-aluminum bronze and the formation process of the protective film in 3.5 wt % NaCl solution are systematically investigated. The results of scanning electron microscope analysis and electrochemical tests indicate that the corrosion resistance of nickel-aluminum bronze is improved due to the formation of the corrosion product film. The change of local electrochemical property on the corrosion product film during the immersion time is evaluated via in-situ scanning vibrating electrode technique, and it reveals the evolution rules of ionic flux in real time. The formation process of the protective film on different phases in nickel-aluminum bronze is observed directly by in-situ atomic force microscopy as height change measurements. The α phases at different locations present different corrosion behaviors, and the lamellar α phase within the α + κIII eutectoid structure gets more serious corrosion attack. The κ phases establish a stable and dense protective film in short time, preventing the corrosion attack effectively. The β′ phase, however, suffers the most serious corrosion damage until a protective film is formed after 150 min of immersion.

Practical Experiences with Linear Polarization Measurements

CORROSION ◽  
1977 ◽  
Vol 33 (4) ◽  
pp. 117-128 ◽  
Author(s):  
R. H. HAUSLER
Keyword(s):  
Corrosion Product ◽  
Linear Polarization ◽  
Tap Water ◽  
Product Layer ◽  
Phase System ◽  
Two Phase ◽  
Ohmic Resistance ◽  
Corrosion Product Layer ◽  
Practical Experiences ◽  
Water Saturated

Abstract The linear polarization technique in principle is a convenient and rapid way for determining corrosion rates. In practice, one finds that it is often applied under conditions alien to the assumptions on the basis of which it was derived. This paper will present a series of comparative observations between linear polarization, resistance probe, and weight loss measurements in different systems. The systems studied were: (1) Hydrochloric acid containing acetylenic inhibitors, (2) a two phase system containing hydrocarbon and water saturated with H2S, and (3) tap water containing various inhibitors. An equation will be derived showing the effect of ohmic resistance due to corrosion product buildup. The effect of polarization on the properties of a corrosion product layer will be discussed qualitatively.

21. Influence of hydrazine and higher pH on the corrosion product layer of austenitic steel

1989 ◽  
pp. 1: 99-104
Author(s):  
J. Kysela ◽  
K. Jindrich ◽  
G. George ◽  
H. Kelm ◽  
D. Nebel ◽  
...  
Keyword(s):  
Austenitic Steel ◽  
Corrosion Product ◽  
Product Layer ◽  
Corrosion Product Layer
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