scholarly journals Anticorrosive Performance of Zinc Phosphate Coatings on Mild Steel Developed Using Galvanic Coupling

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
M. Arthanareeswari ◽  
P. Kamaraj ◽  
M. Tamilselvi
Keyword(s):  
Mild Steel ◽  
Zinc Phosphate ◽  
Salt Spray ◽  
Immersion Test ◽  
Open Circuit ◽  
Galvanic Coupling ◽  
Phosphate Coatings ◽  
Steel Panels ◽  
The One ◽  
Steel Substrates

The anticorrosive performance of zinc phosphate coatings developed by galvanic coupling technique on mild steel substrates using the cathode materials such as titanium (Ti), copper (Cu), brass (BR), nickel (Ni), and stainless steel (SS) is elucidated in this study. Thermal and chemical stability tests, immersion test in 3.5% NaCl, ARE salt droplet test, and salt spray test were carried out. The study reveals that the mild steel substrates phosphated under galvanically coupled condition showed better corrosion resistance than the one coated without coupling. The open circuit potential (OCP) of phosphated mild steel panels in 3.5% NaCl was found to be a function of phosphate coating weight and porosity of the coating.

ANTICORROSION PERFORMANCE OF SELF-HEALING POLYMERIC COATINGS ON LOW CARBON STEEL SUBSTRATES

2017 ◽  
Vol 79 (7-4) ◽  
Author(s):  
Muhammad Ashraff Ahmad Seri ◽  
Esah Hamzah ◽  
Abdelsalam Ahdash ◽  
Mohd Fauzi Mamat
Keyword(s):  
Steel Substrate ◽  
Salt Spray ◽  
Immersion Test ◽  
Salt Spray Test ◽  
Test Method ◽  
The Self ◽  
Self Healing ◽  
Pure Epoxy ◽  
Steel Substrates ◽  
Epoxy Paint

Recently, self-healing coating is classified as one of the smart coatings which has the ability to heal or repair damage of the coating to prevent further corrosion. The aim of this study is to synthesize the self-healing coatings from polymeric material and evaluate the performance and their corrosion behavior when coated on steel substrates. The corrosion tests were performed using immersion test and salt spray test method at room temperature. The immersion test shows that self-healing coating gives lower corrosion rate compared to pure epoxy paint, with a value of 0.02 and 0.05 mm/year respectively. Also, salt spray test shows similar trend as the immersion test, which is 0.11 and 0.19 mm/year for self-healing coating and pure epoxy paint respectively. While uncoated samples without any protection corroded at 0.89 mm/year. It was also found that the damage on self-healing coating was covered with zeolite from the microcapsules indicating that the self-healing agent was successfully synthesized and could function well. In other words, self-healing coating shows better corrosion resistance compared to the pure epoxy coating on steel substrate.

Nano zinc phosphate coatings for enhanced corrosion resistance of mild steel

2015 ◽  
Vol 327 ◽  
pp. 218-225 ◽  
Author(s):  
M. Tamilselvi ◽  
P. Kamaraj ◽  
M. Arthanareeswari ◽  
S. Devikala
Keyword(s):  
Corrosion Resistance ◽  
Mild Steel ◽  
Zinc Phosphate ◽  
Phosphate Coatings ◽  
Nano Zinc

Investigation of Mild Steel Corrosion Rate In San Diego Harbor

CORROSION ◽  
1961 ◽  
Vol 17 (4) ◽  
pp. 188t-190t ◽  
Author(s):  
M. H. PETERSON ◽  
L J. WALDRON
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
San Diego ◽  
Steel Corrosion ◽  
Mild Steel Corrosion ◽  
Steel Panels ◽  
One Year ◽  
The One ◽  
Pit Depth ◽  
Different Levels

Abstract The basic corrosion rate at San Diego has been determined by exposure of an extensive series of mild steel panels for 6, 12, and 18 months. The corrosion rate as determined by weight loss, and the degree of pitting determined by pit depth measurements was measured for unprotected panels, and for three different levels of cathodic protection. The basic corrosion rate for unprotected panels over the one-year exposure was 25.8 mdd and the greatest pit depth found exceeded 60 thousandths of an inch. The fully protected panels suffered virtually no corrosion while the partially protected panels had a corrosion rate of 8.3 mdd. However, the greatest pit depth found on the partially protected panels was only 9 mils. 6.2.3, 2.2.2, 3.2.2, 5.2.1

Development of nano SiO2 incorporated nano zinc phosphate coatings on mild steel

2015 ◽  
Vol 332 ◽  
pp. 12-21 ◽  
Author(s):  
M. Tamilselvi ◽  
P. Kamaraj ◽  
M. Arthanareeswari ◽  
S. Devikala ◽  
J. Arockia Selvi
Keyword(s):  
Mild Steel ◽  
Zinc Phosphate ◽  
Nano Sio2 ◽  
Phosphate Coatings ◽  
Nano Zinc

Effect of Zinc Coating Thickness on Corrosion Performance of Mild Steel in Atmospheric and Seawater Environment

2014 ◽  
Vol 554 ◽  
pp. 213-217 ◽  
Author(s):  
M.S. Noor Idora ◽  
M.M. Rahman ◽  
M. Ismail ◽  
W.B. Wan Nik
Keyword(s):  
Corrosion Rate ◽  
Mild Steel ◽  
Coating Thickness ◽  
Salt Spray ◽  
Zinc Coating ◽  
Immersion Test ◽  
Protective Film ◽  
Corrosion Performance ◽  
Seawater Environment ◽  
Different Thickness

The application of zinc coating as a protective film to the mild steel against corrosion attack in atmospheric and seawater environment was studied. The objective of this study is to evaluate the corrosion performance of mild steel coated by different thickness of zinc under salt spray and also immersion test. The corrosion measurement test was performed by weight loss and potentiodynamic polarization. From the experimental study, it was found that the corrosion rate of mild steel is inversely proportional to the zinc coating thickness. The result also showed that the corrosion rate of mild steel in the salt spray test is higher than the immersion test.

Incorporation of boron nitride nanosheets in zinc phosphate coatings on mild steel to enhance corrosion resistance

2019 ◽  
Vol 374 ◽  
pp. 935-943 ◽  
Author(s):  
Haowei Huang ◽  
Huihui Wang ◽  
Yuhui Xie ◽  
Dexuan Dong ◽  
Xiang Jiang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Boron Nitride ◽  
Mild Steel ◽  
Zinc Phosphate ◽  
Boron Nitride Nanosheets ◽  
Phosphate Coatings

Electrochemical Behavior of Potassium Zinc Phosphates Extract and Coating

2012 ◽  
Vol 152-154 ◽  
pp. 64-67 ◽  
Author(s):  
Dong Ping Wei ◽  
Shao Mei Ma ◽  
Ze Guang Zhou ◽  
Zeng Wei Huang ◽  
Ai Qun Yuan ◽  
...  
Keyword(s):  
Electrochemical Behavior ◽  
Corrosive Medium ◽  
Open Circuit Potential ◽  
Zinc Phosphate ◽  
Electrochemical Impedance ◽  
Electrochemical Corrosion ◽  
Immersion Test ◽  
Open Circuit ◽  
Zinc Phosphates ◽  
Pigment Extract

The electrochemical corrosion inhibitions of potassium zinc phosphate were studied by polarization, open circuit potential measurements, electrochemical impedance of the pigment extract and coating immersion test. Dynamic analysis shows that in pH=7 3.5% NaCl extract, KZn2(PO4)(HPO4) functions as a cathodic inhibitor on steel and its efficiency is even superior to other phosphates. The inhibiting efficiency of the pigments on steel decrease in the order: KZn2(PO4)(HPO4) > aluminum zinc phosphate > zinc phosphate ≧ aluminum triphosphate The coating tests show that potassium zinc phosphate can efficiently enhance the inhibition properties of coating and prevent the erosion of the corrosive medium by improving the barrier and hydrophobicity of the coating. The anticorrosive property of the pigments decrease in the order: KZn2(PO4)(HPO4)> aluminum zinc phosphate > zinc phosphate ≈APW-1.

The Effect of pH on Zinc Phosphate Coating Morphology and its Corrosion Resistance on Mild Steel

2012 ◽  
Vol 626 ◽  
pp. 569-574 ◽  
Author(s):  
Khalid Abdalla ◽  
Rahmat Azmi ◽  
Aziz Azizan
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Mild Steel ◽  
Zinc Phosphate ◽  
Phosphate Coating ◽  
Metallic Materials ◽  
X Ray ◽  
Ph Values ◽  
Phosphate Coatings ◽  
Coating Morphology

Zinc phosphate coating is commonly used for corrosion protection of metallic materials, mainly mild steel. In this study, influence of the pH of phosphating bath on the surface morphology and corrosion resistance of zinc phosphate coatings on mild steel was investigated. The phosphate layers were deposited on steel from phosphating bath at different pH values (1.75 ~ 2.75). The surface morphology and composition of phosphate coatings were investigated via scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX). The corrosion resistance of the coating was evaluated by polarization curves (anodic and cathodic) in an aerated 3.5% NaCl solution. The results showed that better surface coverage and corrosion resistance for the steel phosphated at pH 2.75.

The Influence of Deposition Temperature on the Morphology and Corrosion Resistance of Zinc Phosphate Coating on Mild Steel

2012 ◽  
Vol 626 ◽  
pp. 183-189
Author(s):  
Khalid Abdalla ◽  
Rahmat Azmi ◽  
Aziz Azizan
Keyword(s):  
Corrosion Resistance ◽  
Surface Morphology ◽  
Mild Steel ◽  
Deposition Temperature ◽  
Surface Coverage ◽  
Zinc Phosphate ◽  
Nacl Solution ◽  
X Ray ◽  
Phosphate Coatings ◽  
Different Temperatures

The influence of phosphating temperature on the surface morphology and corrosion resistance of zinc phosphate coatings on mild steel was investigated. The phosphate layers were deposited on steel from phosphating bath at different temperatures (45 ~ 75 C). The surface morphology and composition of phosphate coatings were investigated via scanning electron microscopy (SEM), and energy-dispersive X-ray (EDX). The corrosion resistance of the coatings was evaluated by polarization curves (anodic and cathodic) in an aerated 3.5% NaCl solution. The results showed that the increase in temperature of the phosphating bath up to 55 C caused an increase in surface coverage and in turn resulted in better corrosion resistance. At high temperature (65 °C and 75 °C) the deposition coverage decreased indicating that the best coverage for the phosphate layer on the metal surface was achieved at 55 °C

Effects of Conductive Pigments on the Anti-Corrosion Properties of Zinc-Rich Coatings

2013 ◽  
Vol 652-654 ◽  
pp. 1830-1833
Author(s):  
Ling Chen ◽  
Xue Jiao Zheng ◽  
Hui Ma ◽  
Jia Qing Wang
Keyword(s):  
Aluminum Powder ◽  
Salt Spray ◽  
Zinc Content ◽  
Graphite Powder ◽  
Immersion Test ◽  
Open Circuit ◽  
Salt Spray Test ◽  
Content Increase ◽  
Corrosion Properties ◽  
Iron Phosphide

Effects of replacing partial zinc dust with conductive pigments on the anti-corrosion properties of ethyl silicate zinc-rich coatings with low zinc content were investigated. Salt spray test, salt immersion test and open circuit potential(OCP) measurement were utilized to evaluate anti-corrosion properties. Experimental results revealed that the effects of conductive pigments content on anti-corrosion properties are similar for di-iron phosphide powder, graphite powder and aluminum powder employed in this article. For every kind of conductive pigments, protection life in salt spray test, protection life in salt immersion test, galvanic protection life and initial OCP change with conductive pigments content increase in a similar way. They all reach an extreme point, and all the extreme points correspond to a same replacing ratio named best replacing ratio. The best replacing ratio is 20,15 and 15wt% for di-iron phosphide powder, graphite powder and aluminum powder respectively. Comparing with non-replacing coatings, conductive pigments-containing coatings at best replacing ratio possess both lower zinc content and better anti-corrosion properties.

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