Enhanced corrosion resistance of phytic acid coated magnesium by stearic acid treatment

2013 ◽  
Vol 23 (5) ◽  
pp. 1237-1244 ◽  
Author(s):  
R.K. GUPTA ◽  
K. MENSAH-DARKWA ◽  
J. SANKAR ◽  
D. KUMAR
Keyword(s):  
Corrosion Resistance ◽  
Stearic Acid ◽  
Phytic Acid ◽  
Acid Treatment

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.

Role of phytic acid in the corrosion protection of epoxy-coated rusty steel

2019 ◽  
Vol 66 (2) ◽  
pp. 188-194
Author(s):  
Yingjun Zhang ◽  
Xue-Jun Cui ◽  
Yawei Shao ◽  
Yanqiu Wang ◽  
Guozhe Meng ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Phytic Acid ◽  
Corrosion Protection ◽  
Electrochemical Impedance ◽  
Complex Compounds ◽  
Epoxy Coating ◽  
Stable Complex ◽  
Content Type ◽  
Action Mechanisms ◽  
New Compounds

PurposeThis paper aims to prepare a residual rust epoxy coating by adding different quantities of phytic acid (PA) on the surface of the rusty steel and investigate the corrosion protection of PA and its action mechanisms.Design/methodology/approachA residual rust epoxy coating by adding different quantities of PA was prepared on the surface of the rusty steel. The influence of PA on the corrosion resistance of epoxy-coated rusty steel was investigated by means of electrochemical impedance spectroscopy and adhesion testing.FindingsResults indicated that PA can substantially improve the corrosion resistance of epoxy-coated rusty steel. This improvement is due to the reaction of PA with residual rust and generation of new compounds with protection properties and increased adhesive strength effects on the coating/metal interface. The coating showed better protection performance when 2 per cent PA was added.Originality/valueConsidering the structure of the active groups, PA has strong chelating capability with many metal ions and can form stable complex compounds on the surface of a metal substrate, thereby improving corrosion resistance. In recent years, PA has been reported to be useful in the conversion of coatings or as green corrosion inhibitor. To the best of the authors’ knowledge, few studies have reported the use of PA as a rust converter or residual rust coating. The present work aims to improve the corrosion resistance of residual rust epoxy coating by adding PA.

scholarly journals Stearic Acid Coated MgO Nanoplate Arrays as Effective Hydrophobic Films for Improving Corrosion Resistance of Mg-Based Metallic Glasses

Nanomaterials ◽  
2020 ◽  
Vol 10 (5) ◽  
pp. 947
Author(s):  
Yonghui Yan ◽  
Xiaoli Liu ◽  
Hanqing Xiong ◽  
Jun Zhou ◽  
Hui Yu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Stearic Acid ◽  
Metallic Glasses ◽  
High Strength ◽  
Solution Concentration ◽  
Sweep Rate ◽  
Technological Parameters ◽  
Water Contact ◽  
Cycle Number ◽  
High Elasticity

Mg-based metallic glasses (MGs) are widely studied due to their high elasticity and high strength originating from their amorphous nature. However, their further application in many potential fields is limited by poor corrosion resistance. In order to improve this property, an MgO nanoplate array layer is first constructed on the surface of Mg-based MGs by cyclic voltammetry (CV) treatments. In this situation, the corrosion resistance and hydrophilicity of the material are enhanced. Then, stearic acid (SA) can effectively adhere onto the surface of the MgO layer to form a superficial hydrophobic film with a water contact angle (WCA) of 131°. As a result, the SA coated MgO hydrophobic film improves the corrosion resistance of Mg-based MGs in 3.5 wt.% NaCl solution obviously. In addition, the effects of four technological parameters (solution concentration, sweep rate, cycle number, and reaction temperature) in the CV process on the morphology and size of nano-products are investigated in detail. The work proposes a new method for the creation of nanostructures on the surface of materials and provides a new idea to increase the corrosion resistance of MGs. The related method is expected to be applied in wider fields in future.

Self-healing hybrid coating of phytic acid/silane for improving the corrosion resistance of magnesium alloy

2018 ◽  
Vol 15 (3) ◽  
pp. 571-581 ◽  
Author(s):  
Yan Li ◽  
Shu Cai ◽  
Sibo Shen ◽  
Guohua Xu ◽  
Feiyang Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Phytic Acid ◽  
Hybrid Coating ◽  
Self Healing

Development of Superhydrophobic Coatings on AA 7075 by Surface Modification Using Fatty Acids

2020 ◽  
Vol 833 ◽  
pp. 69-73
Author(s):  
Saikiran Amruthaluru ◽  
Siva Kumar Mamidi ◽  
Arun Mohan Nair ◽  
Hariprasad Sampatirao ◽  
Rameshbabu Nagumothu
Keyword(s):  
Fatty Acids ◽  
Contact Angle ◽  
Corrosion Resistance ◽  
Surface Morphology ◽  
Stearic Acid ◽  
Myristic Acid ◽  
Superhydrophobic Coatings ◽  
Naoh Solution ◽  
Aa 7075 ◽  
Passivation Time

The present work is aimed at developing superhydrophobic coatings on AA 7075 using two different fatty acids namely Stearic acid and Myristic acid. The coating was developed by initially etching the substrate in 1 M NaOH solution at a temperature of 70 °C for 10 hours, followed by passivating in 0.01 M ethanolic stearic acid and 0.01 M ethanolic myristic acid for different durations of passivation time. The coated samples were further investigated for their surface morphology, wettability and corrosion resistance. The contact angle and surface morphology of the developed coatings were assessed by contact angle goniometer and scanning electron microscopy (SEM) respectively. The corrosion behavior of the coatings was studied in 3.5 Wt. % aqueous NaCl solution by potentiodynamic polarization test (PDP). Passivation using fatty acids resulted in alteration of the surface morphology, which resulted in the increase of the contact angle exhibiting superhydrophobic nature, which also enhanced the corrosion resistance of the alloy.

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