Haobo Yu, Zimo Li, Yeyin Xia, Yameng Qi, Yingchao Li, Qiaoping Liu and Changfeng Chen
This paper aims to investigate the anti-biocorrosion performance and mechanism of the Cu-bearing carbon steel in the environment containing sulfate-reducing bacterial (SRB).
Abstract
Purpose
This paper aims to investigate the anti-biocorrosion performance and mechanism of the Cu-bearing carbon steel in the environment containing sulfate-reducing bacterial (SRB).
Design/methodology/approach
The biocorrosion behavior of specimens with Cu concentration of 0 Wt.%, 0.1 Wt.%, 0.3 Wt.% and 0.6 Wt.% were investigated by immersion test in SRB solution. By examining the prepared cross-section of the biofilm using focused ion beam microscopy, SRB distribution, bacterial morphology, biofilm structure and composition were determined. The ion selectivity of the biofilm was also obtained by membrane potential measurement. Moreover, the anti-biocorrosion performance of the Cu-bearing carbon steel pipeline was tested in a shale gas field in Chongqing, China.
Findings
Both the results of the laboratory test and shale gas field test indicate that Cu-bearing carbon steel possesses obvious resistance to microbiologically influenced corrosion (MIC). The SRB, corrosion rate and pitting depth decreased dramatically with Cu concentration in the substrate. The local acidification caused by hydrolyze of ferric ion coming from SRB metabolism and furtherly aggravated by anion selectivity biofilm promoted the pitting corrosion. Anti-biocorrosion of Cu-bearing carbon steel was attributed to the accumulation of Cu compounds in the biofilm and the weaker anion selectivity of the biofilm. This research results provide an approach to the development of economical antibacterial metallic material.
Originality/value
MIC occurs extensively and has become one of the most frequent reasons for corrosion-induced failure in the oil and gas industry. In this study, Cu-bearing carbon steel was obtained by Cu addition in carbon steel and possessed excellent anti-biocorrosion property both in the laboratory and shale gas field. This study provides an approach to the development of an economical antibacterial carbon steel pipeline to resist MIC.
Details
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Zhi Li, Yuemeng Ge, Zegang Su and Xiaohua Huang
This study aims to analyze the basic information of visitors of the Macau Science Center to assess their leisure involvement, satisfaction and behavioral intention, along with the…
Abstract
Purpose
This study aims to analyze the basic information of visitors of the Macau Science Center to assess their leisure involvement, satisfaction and behavioral intention, along with the interaction of these factors. Suggestions are made for museum policy modifications to improve visitor experience quality.
Design/methodology/approach
The analysis methods used in this study included reliability, descriptive statistics, independent-samples t test, ANOVA, correlation analysis and regression analysis.
Findings
The results showed that there was no significant relationship between gender and satisfaction, involvement of leisure or behavioral intention; age and educational level had significant impacts on satisfaction, leisure involvement and behavioral intention; significant differences were found in terms of visitors’ point of geographic origin, namely, local residents, mainland residents and Hong Kong residents; occupation was found to have no significant impact on satisfaction, leisure involvement or behavioral intention; monthly income was found to have no significant impact on leisure involvement and behavioral intention, but did have a significant impact on satisfaction; number of visits had no significant impact; there was no significant difference in leisure involvement and behavioral intention among different types of visitors, but there was a significant difference in terms of satisfaction; and significant correlations were found between leisure involvement and behavioral intentions.
Originality/value
The value of this study is to identify problems and offer potential solutions for the improvement of the Macau Science Center by studying the leisure involvement, satisfaction and behavioral intention of museum visitors. The proposed measures can improve the visibility and quality of the science museum, attract additional visitors and improve Macau’s branding through promoting science education and tourism.