scholarly journals Diagnosis of Water Quality for Galvanized Steel Corrosion by Mahalanobis Distance

2008 ◽  
Vol 57 (2) ◽  
pp. 89-95 ◽  
Author(s):  
Eri Takamiya ◽  
Hiroshi Nakajima ◽  
Kiyoshi Hosoya ◽  
Ayumi Takahashi ◽  
Masayuki Itagaki
Keyword(s):  
Water Quality ◽  
Mahalanobis Distance ◽  
Steel Corrosion ◽  
Galvanized Steel

A transient multi-ion transport model for galvanized steel corrosion protection

2012 ◽  
Vol 77 ◽  
pp. 339-347 ◽  
Author(s):  
V. Topa ◽  
A.S. Demeter ◽  
L. Hotoiu ◽  
D. Deconinck ◽  
J. Deconinck
Keyword(s):  
Ion Transport ◽  
Corrosion Protection ◽  
Transport Model ◽  
Steel Corrosion ◽  
Galvanized Steel

scholarly journals Development of an Adaptive Model for the Rate of Steel Corrosion in a Recirculating Water System

Processes ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 1639
Author(s):  
Xiaochuan Huang ◽  
Yan Gao ◽  
Ling Zhu ◽  
Ge He
Keyword(s):  
Water Quality ◽  
Corrosion Rate ◽  
Water Quality Management ◽  
Water System ◽  
Steel Corrosion ◽  
Economic Benefits ◽  
Quality Analysis ◽  
Stable Operation ◽  
Circulating Water ◽  
Rate Prediction

The stable quality of circulating water ensures the long-term stable operation of various processes in petrochemical production and achieves energy savings and emission reduction while reducing environmental pollution and yielding economic benefits to petrochemical enterprises. However, traditional circulating water quality evaluation and modeling for corrosion rate prediction suffer from adaptability and accuracy problems. To address these problems, the water quality analysis data of the circulating water in the field were subjected to data preprocessing and water quality index calculation to perform feature engineering, followed by modeling using a machine learning method that integrates the adaptive immune genetic algorithm and random forest (RF) algorithm and can intelligently select the water quality parameters to be used as the input variables for the RF modeling. Finally, the method was validated using an industrial example, and the results indicate that the method is capable of removing interference variables and is suitable for carbon steel corrosion rate prediction based on water quality models. The proposed method provides a basis for water quality management and real-time decision-making by circulating water field personnel.

Hydrogen Embrittlement and Corrosion Fatigue Performance of Galvanized Steel Wires for High Strength Bridge Cables

2010 ◽  
Vol 146-147 ◽  
pp. 134-142
Author(s):  
Ying Ma ◽  
Jian Shu Ye ◽  
Wan Guang Ge ◽  
Jing Lin
Keyword(s):  
Hydrogen Embrittlement ◽  
Corrosion Fatigue ◽  
Stress Amplitude ◽  
Critical Concentration ◽  
Steel Corrosion ◽  
High Strength ◽  
Critical Value ◽  
Galvanized Steel ◽  
Steel Wires ◽  
Dry Conditions

The research results of mechanical properties, hydrogen embrittlement and corrosion fatigue of new and corroded galvanized wires which were used in cable-supported bridges were summarized. Actual tensile strength of corroded wires did not decrease with corrosion levels, whereas elongation and torsional strength decreased sharply after the zinc layer was partly depleted and the steel started to corrode. The accumulated amounts of diffusive hydrogen of corroded wires with and without induced tension were almost the same and were well below a critical value of 0.7ppm. Therefore, induced tensions of steel wires did not affect the amount of diffusive hydrogen and below the critical concentration to cause brittleness. Fatigue strength did not change only when the galvanized layer was corroded, but it significantly decreased after the steel corrosion below the galvanized layer progressed. The corrosion fatigue life under wet conditions was shorter than that under dry conditions. The endurance life of pre-split steel wires was decreased in stress amplitude and increased in load frequency under fluctuating loading and corrosive environment, the aggressive media accelerated the growth rate of the fatigue crack.

scholarly journals The impact of produced hydrogen gas and calcium zincate on changes of porous structure of cement paste in the vicinity of hot-dip galvanized steel

2017 ◽  
Vol 61 (2) ◽  
pp. 67-79
Author(s):  
P. Pokorný ◽  
R. Pernicová ◽  
M. Vokáč ◽  
I. Sedlářová ◽  
M. Kouřil
Keyword(s):  
Porous Structure ◽  
Cement Paste ◽  
Mercury Porosimetry ◽  
Steel Corrosion ◽  
Hydrogen Gas ◽  
Galvanized Steel ◽  
Passive State ◽  
Pure Zinc ◽  
Cement Binder ◽  
The Impact

Abstract The paper summarizes the impact of produced hydrogen and calcium hydroxyzincate (Ca[Zn(OH)3]2·2H2O) on the formation of the porous structure of cement paste in the vicinity of hot-dip galvanized steel. These substances result from cathodic (hydrogen) and anodic (zincates-formed by reaction with hydroxides) corrosion reactions of hot-dip galvanized steel (or pure zinc) in the cement paste. The cement binder pore structure was studied by means of mercury porosimetry and analysis of scanning electron microscopy and confocal microscopy images. The porosity of the cement paste at the galvanized steel / cement interphase increased as a result of galvanized steel corrosion while hydrogen was formed. Such a porous structure was maintained throughout the maturation of cement paste. Kinetics of galvanized steel corrosion related primarily to water transport through the binder. The formation of calcium zincate did not result in transition of galvanized steel from active to passive state corrosion.

scholarly journals Diagnosis of Water Quality for Carbon Steel Corrosion by Mahalanobis-Taguchi Method

2006 ◽  
Vol 55 (7) ◽  
pp. 300-305 ◽  
Author(s):  
Masayuki Itagaki ◽  
Eri Takamiya ◽  
Kunihiro Watanabe ◽  
Takanori Nukaga ◽  
Fumio Umemura
Keyword(s):  
Water Quality ◽  
Carbon Steel ◽  
Taguchi Method ◽  
Steel Corrosion
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