Passivator Composition of Rich of Phytic Acid Used for Brass-Strip

2011 ◽  
Vol 399-401 ◽  
pp. 36-39 ◽  
Author(s):  
Wei Cai ◽  
Li Li ◽  
Ren Hui Liu ◽  
Zhen Zhen Wan
Keyword(s):  
Hydrogen Peroxide ◽  
Polyethylene Glycol ◽  
Boric Acid ◽  
Phytic Acid ◽  
Mass Fraction ◽  
Orthogonal Experiment ◽  
Corrosion Current ◽  
Sodium Dichromate ◽  
Electrochemical Test ◽  
Passivation Film

Passivator components of phytic acid, hydrogen peroxide, boric acid and polyethylene glycol was optimized by orthogonal experiment. Corrosion resistance of passivation film of brass-strip was invertigated by salt spraying, weight loss and electrochemical test. The results show that the optimization passivator consists of phytic acid (50% mass fraction) 8ml/L, hydrogen peroxide (mass fraction 30%) 30ml/L, boric acid 5g/L, polyethylene glycol 15ml/L and additive 4g/L. Corrosion current density and corrosion rate of the brass-strip specimens coated by rich-phytic acid passivator are similar to that treated by traditional sodium dichromate passivator, the characteristic of anti-tarnish slightly better than that coated by sodium dichromate passivator. The feature of rich-phytic acid passivator is environmental protection.

The Fabrication of Self-Assembled Film on Steel Surface

2013 ◽  
Vol 364 ◽  
pp. 674-678
Author(s):  
Ze Min Chen ◽  
Xue Chao Jiao ◽  
Xuan Zhou ◽  
Su Hong Wang
Keyword(s):  
Citric Acid ◽  
Boric Acid ◽  
Silane Coupling Agent ◽  
Steel Surface ◽  
Sea Water ◽  
Orthogonal Experiment ◽  
Analysis Experiment ◽  
Silane Coupling ◽  
Single Factor Analysis ◽  
Self Assembled

Fabrication of self-assembled film used 792(silane coupling agent), citric acid, boric acid and triethanolamine as the main materials. Through orthogonal experiment and the single factor analysis experiment, the optimum technological conditions are 792 10mL·L-1, citric acid 24g·L-1, boric acid 8g·L-1, triethanolamine 7.5mL·L-1, temperature 20~21°C, time 10min. Simulated sea water (3% Sodium chloride) is applied to measure the effects of the film. The results show that the processing is simple, tank liquor is stable, and film is uniform, dense and colorless.

The Study about Environmentally-Friendly Passivation Technology Process and Performance on Brass Surface

2011 ◽  
Vol 399-401 ◽  
pp. 1967-1971
Author(s):  
Hong Yin Xu ◽  
Li Li
Keyword(s):  
Corrosion Resistance ◽  
Phytic Acid ◽  
Passive Film ◽  
Ph Value ◽  
Sodium Molybdate ◽  
Solution Ph ◽  
Sulfosalicylic Acid ◽  
Passivation Film ◽  
Brass Surface ◽  
And Performance

The paper through the synergy before mixed Phytic acid and Sodium molybdate, Sulfosalicylic acid, Organic silane, and add the active substances PEG, Optimize the Passivation liquid formula of Brass surface, Phytic acid is the main ingredient, study the affection of Phytic acid Passive film Corrosion resistance on the three main Passivation conditions: Passivation temperature, time and Passivation solution PH value. The results show that，Phytic acid passivation film process recipes as follows：Phytic acid (quality score 50%) 2~5ml/L, sodium molybdate 4~8g/L, organic material 10~30ml/L, sulfosalicylic acid 3~7g/L, polyethylene glycol 2~6g/L, deactivated temperature 30~35°C, pH value 5, deactivated time 60s. The test showed that，the phytic acid passive film can obviously enhance the anti-corrosive performance on the brass surface, its corrosion resistance proportion chromates passive film is fairly good.

Study on Crosslinking in Diimide Reduction of Nitrile Butadiene Rubber

2006 ◽  
Vol 79 (4) ◽  
pp. 602-609
Author(s):  
Shuqin Zhou ◽  
Shaoyi Li ◽  
Huadong Bai
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Time ◽  
Boric Acid ◽  
Esr Spectroscopy ◽  
Redox System ◽  
Nitrile Group ◽  
Crosslinking Reaction ◽  
Butadiene Rubber ◽  
Drying Process ◽  
Spectroscopy Analysis

Abstract Acrylonitrile-butadiene rubber (NBR) in latex form was selectively hydrogenated by redox system consisting of hydrazine hydrate and hydrogen peroxide, with boric acid as catalyst. Soluble hydrogenated NBR latex was obtained; but the coagulated products were gelled on drying. This problem becomes the major obstacle for the hydrogenation technique to be commercialized. It is important to study the crosslinking reaction in the system and to solve the problem. The cause for the crosslink was investigated in three possibilities: (i) crosslinking caused by the hydrogenation of CN group; (ii) by the oxidation of C=C double bonds and (iii) by radicals in the system. The control of the crosslink was also studied. The oil resistant nitrile group —CN on the polymer chain had no change during drying process. There were no signs of carbonyl group C=O formed by oxidation and amine like groups -NH- formed by the hydrogenation of CN in HNBR gel fraction. The newly formed alkoxyl radicals were detected by ESR spectroscopy analysis in the hydrogenation system after specific reaction time. Crosslinking reaction was controlled to a large extent by using hydroquinone as gel inhibitor.

Corrosion Behaviour of Aluminium Alloy in Palm Oil Methyl Ester (B100)

2012 ◽  
Vol 58 (2) ◽  
Author(s):  
W. B. Wan Nik ◽  
S. Syahrullail ◽  
R. Rosliza ◽  
M. M. Rahman ◽  
M. F. R. Zulkifli
Keyword(s):  
Weight Loss ◽  
Methyl Ester ◽  
Corrosion Rate ◽  
Aluminium Alloy ◽  
Palm Oil ◽  
Corrosion Behaviour ◽  
Corrosion Current ◽  
Electrochemical Test ◽  
Weight Loss Method ◽  
Loss Method

The aim of this study is to determine the corrosion effect of palm oil methyl ester (POME) on aluminium alloy 5083 (AA5083). The static immersion test was carried out at 60°C for 68 days according to ASTM G–31–72. The corrosion analysis was done by using weight loss method and electrochemical test. The result from weight loss method shows the decreasing in weight loss of AA5083 which signifies the ability of POME to reduce corrosion rate. The electrochemical test shows the decreasing in polarization resistance,Rp, while the corrosion current densities, Icorr, increase. The corrosion rate reduces from 2.250mpy to 0.1946mpy. The low concentration of fatty acid C18:2 and high anti oxidant element contributes to the reduction of corrosion rate of AA5083 in POME.

Aqueous Two-Phase Extraction of Potassium Glycyrrhizinate with Polyethylene Glycol/(NH4)2SO4

2012 ◽  
Vol 550-553 ◽  
pp. 1687-1690
Author(s):  
Chen Sun ◽  
Wen Ju Liu ◽  
Hai Ming Zhang
Keyword(s):  
Polyethylene Glycol ◽  
Mass Fraction ◽  
Ph Value ◽  
Phase System ◽  
Phase Extraction ◽  
Two Phase ◽  
Aqueous Two Phase System ◽  
Result Show ◽  
A New Technique ◽  
Aqueous Two Phase Extraction

An aqueous two-phase system of polyethylene glycol (PEG)/(NH4)2SO4 with the behavior of forming aqueous two-phase and the distribution rules of potassium glycyrrhizinate in the aqueous two-phase system were studied. Effects of the molecular weight of PEG, the mass fraction of PEG and (NH4)2SO4, and pH value were investigated. The result show that when the mass fraction of PEG1000 was 50%, the mass fraction of (NH4)2SO4 was 5.7%, and pH value was 6.5, the highest extraction recovery of potassium glycyrrhizinate could reach 99.7%. This aqueous two-phase extraction may provide a new technique for separation of potassium glycyrrhizinate.

Preparation and Mechanical Properties of Cotton Stalk Bast Fibers Reinforced Polypropylene Composites

2012 ◽  
Vol 482-484 ◽  
pp. 929-932 ◽  
Author(s):  
Zheng Wu ◽  
Chun Yan Wei ◽  
Li Hua Lv
Keyword(s):  
Mechanical Properties ◽  
Mass Fraction ◽  
Orthogonal Experiment ◽  
Matrix Material ◽  
Processing Condition ◽  
Molding Pressure ◽  
Cotton Stalk ◽  
Cold Forming ◽  
Molding Temperature ◽  
Bast Fibers

The cotton stalk bast fibers are a new kind of natural cellulose fibers, which have the similar properties as the flax fibers. Polypropylene (PP) is a type of matrix material and commonly used in composites. The cotton stalk bast fibers as reinforced materials and PP as matrix were used to make a new kind of composite in the experiment. The composites were prepared by mixing, molding and cold forming. Orthogonal experiment table including mass fraction of fibers, molding temperature, molding pressure and molding time was devised. Then the flexural strength, tensile strength and impact strength were tested and the analysis of range was done. The optimal processing condition was obtained as follows: mass fraction of fibers was 30%, molding temperature was 190°C, molding pressure was 12MPa and molding time was 480s. The result showed that the cotton stalk bast fibers reinforced PP composites had good mechanical properties.

Study on the BTSPS Silane Film Prepared on the Surface of the 2A12 Aluminum Alloy

2014 ◽  
Vol 936 ◽  
pp. 1071-1076
Author(s):  
Long Jiang Peng ◽  
Shao Hui Chen ◽  
Ying Ning Feng ◽  
Tian Yi Li
Keyword(s):  
Aluminum Alloy ◽  
Volume Fraction ◽  
Orthogonal Experiment ◽  
Influence Factors ◽  
Dip Coating ◽  
Hydrolysis Time ◽  
Electrochemical Test ◽  
Coating Method ◽  
Hydrolysis Temperature ◽  
Dip Coating Method

The protective silane film BTSPS was prepared on the surface of 2A12 aluminum alloys by dip-coating method in this paper. The influence factors such as the volume fraction, hydrolysis time, hydrolysis temperature and dip-coating time of BTSPS were studied through orthogonal experiment. The optimum conditions is: the volume fraction is 5%; hydrolysis time is 180min; Hydrolysis temperature is 20°C; Dipping time is 10 min. The silane film performance was investigated by electrochemical test, sodium chloride solution immersion and scanning electron microscope (SEM). The results show that the corrosion resistance of the 2A12 aluminum alloy coated with BTSPS is improved greatly.

Stability of the Mg65Y10Cu15Ag10 metallic glass in neutral and weakly acidic media

2003 ◽  
Vol 18 (1) ◽  
pp. 97-105 ◽  
Author(s):  
R. V. Subba Rao ◽  
U. Wolff ◽  
S. Baunack ◽  
J. Eckert ◽  
A. Gebert
Keyword(s):  
Metallic Glass ◽  
Boric Acid ◽  
Ph Value ◽  
Saturated Calomel Electrode ◽  
Corrosion Current ◽  
Borate Buffer ◽  
Borate Buffer Solution ◽  
Acidic Media ◽  
Buffer Solution ◽  
Chemical States

The corrosion behavior of the bulk glass-forming Mg65Y10Cu15Ag10 alloy was studied in neutral and weakly acidic media. Potentiodynamic polarization studies in cyclic and linear modes were carried out in electrolytes with a pH = 7, containing different anions. The alloy corroded freely in electrolytes with sulfate and pthalate ions, whereas passivity was observed in the electrolyte with borate ions. Further tests were performed in boric-acid-added borate buffer solution with pH = 7, 6, and 5. From Tafel characteristics, corrosion potentials and corrosion current densities were estimated. The data were compared with those of the ternary Mg65Y10Cu15 metallic glass. Potentiostatic anodic polarization tests were conducted on the Mg65Y10Cu15Ag10 alloy in boric-acid-added borate buffer solution with pH = 7 at two different potentials, 800 and 300 mV, saturated calomel electrode, which revealed different current transient characteristics. Auger electron spectroscopy was employed to characterize the anodically generated passive layers. The depth distributions of the elements as well as their chemical states were detected to be different for layers formed in electrolytes (i) with different pH values (8.4 and 7) of the same anion, (ii) with the same pH value but containing different anions (borate, sulfate, and pthalate), and (iii) with the same pH value and anion (borate) but at two different anodic potentials.

Liquefaction of Bamboo Polyhydric Alcohols and its Application in Polyurethane Foam Materials

2013 ◽  
Vol 781-784 ◽  
pp. 632-635
Author(s):  
Jin Ping Zhang ◽  
Meng Hao Du ◽  
Li Song Hu
Keyword(s):  
Compressive Strength ◽  
Sulfuric Acid ◽  
Polyethylene Glycol ◽  
Polyurethane Foam ◽  
Mass Fraction ◽  
Elasticity Modulus ◽  
Mass Ratio ◽  
Polyethylene Glycol 400 ◽  
Polyhydric Alcohols ◽  
Bamboo Powder

Liquefy bamboo powder with the liquefacient of polyethylene glycol 400 and glycerin, and use the obtained liquefied product for preparing polyurethane foam materials. Results indicate that: 1) liquefaction ratio will be the highest when the proportion of PEG400 and glycerin is 80/20; 2) when the bamboo is liquefied, liquefied effect will be better if the mass ratio of bamboo powder and polyhydric alcohols is above 1: 4; 3) liquefaction ratio will be the highest when it is liquefied for 120min with 3% mass fraction of the catalyst--sulfuric acid and 170°C liquefied temperature; 4) hydroxyl value of the liquefied product of bamboo powder is 333.8mgKOH/g; 5) through the adjustment of foaming formula and technology, compressive strength of polyurethane plate with the thickness of 10mm and with the density of polyurethane foam materials of 0.4g/cm3, which is obtained from bamboo powder liquefied product is 17MPa, and the elasticity modulus is 1000MPa.

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