scholarly journals Effect of Alginate Additives on the Microstructure and Properties of Phytic Acid-based Conversion Coating on a Steel Surface

2019 ◽  
pp. 11429-11444
Author(s):  
Yong Lu ◽  
Keyword(s):  
Phytic Acid ◽  
Steel Surface ◽  
Conversion Coating ◽  
Microstructure And Properties

Microstructure and Properties of 40CrNiMoA Steel Surface After Laser Quenching

2020 ◽  
Vol 57 (1) ◽  
pp. 011405
Author(s):  
杨振 Yang Zhen ◽  
樊湘芳 Fan Xiangfang ◽  
邱长军 Qiu Changjun ◽  
李勇 Li Yong ◽  
柳宁 Liu Ning
Keyword(s):  
Steel Surface ◽  
Microstructure And Properties ◽  
Laser Quenching

Study on the Technology of the Environment-Friendly Conversion Coating Containing Phytic Acid for Magnesium Surface

2009 ◽  
Vol 610-613 ◽  
pp. 905-910 ◽  
Author(s):  
Ji Xing Lin ◽  
Li Yuan Niu ◽  
Guang Liang Gao
Keyword(s):  
Phytic Acid ◽  
Ph Value ◽  
Conversion Coating ◽  
Immersion Method ◽  
Environment Friendly ◽  
Waste Gas ◽  
Whole Process ◽  
Coating Formation ◽  
Magnesium Surface ◽  
Surface Conversion

An anticorrosion conversion coating on metal magnesium surface was prepared using immersion method in an aqueous solution containing mainly phytic acid. The coating after the preparation could be dry in the air without a rinse process using water in the final stage. Hence there is no discharge of waste water and waste gas in the whole process. Influence of several factors on the anticorrosion performance of coating was tested. And optimal parameters in the coating formation process were obtained from orthogonal test. The results indicated that the coating had better corrosion resistance, when the solution contained 3% phytic acid, and the immersion time is 7 minutes and the PH value was 3.5. The surface conversion coating was characterized by SEM and EDS. The conversion coating is better than the traditional chromate passive film by testing corrosion speed of coatings using hydrogen evolution method. The technology of the environment-friendly conversion coating containing phytic acid has the potential to be a new anti-corrosion technology for magnesium surface.

Influencing Factors of Phytic Acid Conversion Coating on AZ91 Magnesium Alloy

2011 ◽  
Vol 239-242 ◽  
pp. 2336-2341
Author(s):  
Yan Ling Lu ◽  
Yan Kun Chen ◽  
Shi Guo Du ◽  
Yi Guo ◽  
Qing Hong
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Phytic Acid ◽  
Acid Concentration ◽  
Ph Value ◽  
Conversion Coating ◽  
Metal Corrosion ◽  
Anode Current Density ◽  
Az91 Magnesium Alloy ◽  
Az91 Magnesium

AZ91 magnesium alloy is selected as the matrix metal. SEM, EDS, Tafel and EIS were adopted and spot test was carried out to investigate the influence of pH value, phytic acid concentration, temperature,conversion time on corrosion resistance of conversion coatings. Result shows that process of phytic acid forming is the controlled metal corrosion process and the uneven surface pattern reflects the different chemical properties of two-phase current on magnesium alloy surface, which is implied by the conversion surface. It is proved by the test that pH value is committed the most to the corrosion resistance of the conversion coating, and the next is the phytic acid concentration. It is found that the corrosion resistance of the conversion coating is the best when pH value of the conversion solution is 4.5; The conversion coating has little influence on the cathode reaction dynamics, however, more importantly, it changes the dynamics of the alloy electrode anode solution reaction, therefore, the alloy’s anode current density decreases while the corrosion resistance of magnesium alloy is enhanced.

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