scholarly journals Coupling Effects of pH and Dissolved Oxygen on the Corrosion Behavior and Mechanism of X80 Steel in Acidic Soil Simulated Solution

Materials ◽  
2019 ◽  
Vol 12 (19) ◽  
pp. 3175 ◽  
Author(s):  
Shuaixing Wang ◽  
Xiaole Yin ◽  
Hao Zhang ◽  
Daoxin Liu ◽  
Nan Du
Keyword(s):  
Dissolved Oxygen ◽  
Corrosion Behavior ◽  
Ph Value ◽  
Product Layer ◽  
Low Ph ◽  
Acidic Soil ◽  
Corrosion Mechanism ◽  
Coupling Effects ◽  
Effects Of Ph ◽  
X80 Steel

In an acidic red soil environment, the corrosion mechanism of X80 steel may be closely related to the pH value and oxygen content, but it has not yet formed a systematic understanding. In this paper, the coupling effects of pH and dissolved oxygen on the corrosion behavior and mechanism of X80 steel in an acidic soil simulated solution were further analyzed by electrochemical methods and three-dimensional video microscope. Results showed that the hydrogen reduction reaction was almost the only cathode process in the anoxic and low pH system, and small and dense pits were present on the electrode surface. pH value increased, the pits decreased, but the size of pits increased. In the oxygen-adequate system, oxygen-consuming (OC) corrosion preferentially occurred, and a protective corrosion product layer (including FeOOH, Fe3O4, etc.) might be formed accordingly, but the proportion of hydrogen evolution (HE) increased and the product layer had defects at a low pH environment. The specific corrosion mechanism of X80 steel in an acidic soil simulated solution is described in the relevant models.

Effect of pH on the Luminescent Properties of the Green Fluorescent Ink-Jet Ink

2011 ◽  
Vol 380 ◽  
pp. 107-111 ◽  
Author(s):  
Shao Hong Gao ◽  
Xian Fu Wei ◽  
Bei Qing Huang ◽  
Chun Yan Lu
Keyword(s):  
Quantum Yield ◽  
Ph Value ◽  
Luminescent Properties ◽  
Low Ph ◽  
Luminous Intensity ◽  
Ink Jet ◽  
Effects Of Ph ◽  
Deep Ultraviolet ◽  
Fluorescent Quantum Yield ◽  
Green Fluorescent

pH value of fluorescent ink-jet ink has an obvious influence on fluorescent powder, high or low pH value could cause some problems, such as fluorescence quenches, fluorescent quantum yield decreased, and so on. And these factors make against fluorescent ink-jet ink luminous properties reach the best result. This article is to design fluorescent ink-jet ink formula when it is exposured to deep Ultraviolet light to display green, and a series of ink samples were prepared. pH regulator was used to regulate pH value of green fluorescent ink-jet ink system. This paper discusses the effects of pH value on luminous intensity, fluorescent quantum yield. The results indicated that triethanolamine can regulate pH value of fluorescent ink-jet ink, when pH value increases from 8.70 to 11.20, luminous intensity, fluorescent quantum yield have a decrease tendency.

scholarly journals Corrosion Behavior of X80 Pipe Steel under HVDC Interference in Sandy Soil

Metals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 809 ◽  
Author(s):  
Runzhi Qin ◽  
Yanxia Du ◽  
Zitao Jiang ◽  
Xiuyun Wang ◽  
Anqing Fu ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Sandy Soil ◽  
Direct Current ◽  
Corrosion Mechanism ◽  
High Voltage Direct Current ◽  
Corrosion Reaction ◽  
Local Soil ◽  
X80 Steel ◽  
Remaining Time ◽  
Peak Value

With the development of high voltage direct current (HVDC) systems, some pipelines have been badly interfered. The corrosion mechanism of pipelines has not been clearly clarified. In this work, laboratory experiments were designed to study the corrosion behavior of X80 steel under HVDC interference in sandy soil. The corrosion rates were related to the change in direct current (DC) density, which experienced three stages in the interference process. As soon as high DC interference voltage was applied to the working electrode, the current density increased sharply to a peak value in a few seconds. It then decreased rapidly to a steady value over dozens of seconds. Finally, it remained steady for the remaining time. With the measurement of local soil properties, the change in DC density was attributed to the local soil temperature increment, the water content decrement, and the substantial growth in the soil spread resistance. Moreover, the parameters contribute to the corrosion reaction during the interference process. The corrosion products were characterized at different times of interference via Raman spectroscopy. Lepidocrocite was produced under high DC density and then transformed to hematite under low DC density. Based on the above, the corrosion model during HVDC interference is proposed.

Effects of pH Value on Corrosion Behavior of Thermal-Sprayed Al-Si Coated Q235 Steel in Simulated Soil Solutions

2014 ◽  
Vol 23 (6) ◽  
pp. 2265-2273 ◽  
Author(s):  
Xinqiang Wu ◽  
Jian Xu ◽  
Wei Ke ◽  
Song Xu ◽  
Bing Feng ◽  
...  
Keyword(s):  
Corrosion Behavior ◽  
Ph Value ◽  
Q235 Steel ◽  
Soil Solutions ◽  
Effects Of Ph

scholarly journals Study on corrosion behavior of X80 steel under stripping coating by sulfate reducing bacteria

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Yan-Yu Cui ◽  
Yong-Xiang Qin ◽  
Qing-Miao Ding ◽  
Yu-Ning Gao
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Sulfate Reducing Bacteria ◽  
Fluorescent Labeling ◽  
Corrosion Products ◽  
Economic Losses ◽  
Corrosion Mechanism ◽  
Sulfate Reducing ◽  
X80 Steel ◽  
Reducing Bacteria

Abstract Background At present, microorganism has been considered as important factors that threaten to buried pipelines with disbonded coatings. Aiming at the problem of unknown corrosion mechanism of sulfate-reducing bacteria (SRB), a series of studies have been carried out in this paper. Spectrophotometer and fluorescent labeling technology are used to study the growth and attachment of SRB in the simulated soil solution. The corrosion behavior of X80 pipeline steel with or without SRB was researched by electrochemical methods such as open circuit potential, dynamic potential polarization curve, and electrochemical impedance spectroscopy. The microscopic morphology of the corrosion products on the surface was observed with a scanning electron microscope (SEM), and the element content of the corrosion products on the surface of the sample after corrosion was observed using X-ray energy spectrum (EDS) analysis. Results The results showed that the growth and reproduction of SRB caused the pH of the soil simulated solution to increase, which may promote the corrosion of X80 steel. In addition, the cathode reaction of X80 steel in a sterile environment is the reduction of H+, and the main corrosion product is iron oxide. When the soil simulation solution contains SRB, the cathodic reaction is controlled by both H+ reduction and sulfide depolarization reactions, and FeS appears in the corrosion products. Conclusion Although the life cycle of SRB is only about 14 days, the corrosion of X80 steel is greatly promoted by SRB, and even causes corrosion perforation, which will bring huge economic losses and serious safety hazards.

scholarly journals Assessing the impact of chemical fertilizers on soil acidification: A study on Jorhat district of Assam, India

2019 ◽  
Vol 38 (4) ◽  
Author(s):  
Rituraj Neog
Keyword(s):  
Ph Value ◽  
Soil Health ◽  
Low Ph ◽  
Acidic Soil ◽  
Chemical Fertilizers ◽  
Small Areas ◽  
Neutral Soil ◽  
R Value ◽  
Paddy Cultivation ◽  
The Impact

Soil pH is a measure of soil alkalinity or acidity. It is a significant indicator of soil health. The acidic soil (low pH value) constitutes much of the areas of Jorhat district with proportionally small areas of neutral soil. The ‘r’ value of -0.538 with ‘P’value of 0.0365 express the existence of almost a strong negative as well as significant relationship between fertilizers consumption and pH value of soil. The dominance of highly acidic soil in the southern and central part of the Jorhat district portrays normally limited suitability (Low productivity) of soil for the cultivation of paddy (rice). Though most the areas in the northern part of Brahmaputra river (i.e. Majuli island) constitutes highly productive (production per ha) soil for paddy cultivation.

DIP quality influenced by process water quality

TAPPI Journal ◽  
2014 ◽  
Vol 13 (9) ◽  
pp. 51-60
Author(s):  
DENNIS VOSS ◽  
HANS-JOACHIM PUTZ ◽  
SAMUEL SCHABEL
Keyword(s):  
Water Quality ◽  
Surface Tension ◽  
Ph Value ◽  
Water Hardness ◽  
Process Water ◽  
Test Results ◽  
Negative Effects ◽  
Water Parameters ◽  
Effects Of Ph ◽  
Contamination Levels

The need for deinking mills to reduce their fresh water consumption has resulted in higher loads of various contaminants in the process water. Lower recovered paper quality also leads to higher contamination levels in the mills. This higher load has an influence on achievable target brightness. The objective of the work was to determine and explain the main reasons for relatively poor deinked pulp quality or poor deinking potential based on the influence of recovered paper composition and process water quality. The process water parameters significantly affect the deinking potential of recovered paper. The test results showed the negative effects of increased water hardness. For standard recovered paper mixtures, flotation selectivity is higher with increasing flotation pH-value. Good results were realized for standard recovered paper with low hardness, low surface tension, and high pH-value. The results for recovered paper containing flexo newsprint could be slightly improved with low hardness, low surface tension, and low pH-value. The results of the test program using design of experiments showed interacting effects of pH-value and surface tension on luminosity and flotation selectivity.

Effects of pH Value in the Electrolyte on the Properties of Cu2ZnSnS4Thin Film Fabricated by Single Step Co-Electrodeposition

2016 ◽  
Vol 5 (9) ◽  
pp. P521-P525 ◽  
Author(s):  
Hong Zhang ◽  
Shuying Cheng ◽  
Jinling Yu ◽  
Yunfeng Lai ◽  
Haifang Zhou ◽  
...  
Keyword(s):  
Ph Value ◽  
Single Step ◽  
Effects Of Ph
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