scholarly journals Studies on sealing of anodic oxide coatings of aluminum by gas adsorption method

1972 ◽  
Vol 22 (3) ◽  
pp. 193-198
Author(s):  
Kizo SHIBATA ◽  
Hiromitsu KAMON ◽  
Shoichi ANADA ◽  
Kiyoshi TAKESHITA
Keyword(s):  
Gas Adsorption ◽  
Anodic Oxide ◽  
Oxide Coatings ◽  
Adsorption Method

THE EFFECT OF ELECTROLYTE TEMPERATURE AND SEALING SOLUTION IN ANODIZING OPERATION ON HARDNESS AND WEAR BEHAVIOR OF 7075 -T6 ALUMINUM ALLOY

2019 ◽  
Vol 26 (02) ◽  
pp. 1850143
Author(s):  
SAEED NIYAZBAKHSH ◽  
KAMRAN AMINI ◽  
FARHAD GHARAVI
Keyword(s):  
Weight Loss ◽  
Wear Resistance ◽  
Aluminum Alloy ◽  
Wear Behavior ◽  
Anodic Oxide ◽  
Boiling Water ◽  
Electrolyte Temperature ◽  
Oxide Coatings ◽  
Sodium Dichromate ◽  
Pin On Disk

Anodic oxide coatings are applied on aluminum alloys in order to improve corrosion resistance and to increase hardness and wear resistance. In the current study, a hard anodic coating was applied on AA7075-T6 aluminum alloy. To survey the anodizing temperature (electrolyte temperature) effect, three temperatures, namely, [Formula: see text]C, 0∘C and 5∘C were chosen and the samples were sealed in boiling water and sodium dichromate to study the role of sealing. For measuring the oxide coatings porosity and hardness and also for comparing the samples’ wear resistance field-emission scanning electron microscopy (FESEM), microhardness test and pin-on-disk method were utilized, respectively. The results showed that by increasing the anodizing temperature, hardness and consequently wear resistance decreased so that hardness and weight loss in the samples with no sealing decreased from 460[Formula: see text]HV and 0.61[Formula: see text]mg at [Formula: see text]C to 405 and 358[Formula: see text]HV and 1.05 and 1.12[Formula: see text]mg at 0∘C and 5∘C, respectively, which is due to the porosity increment by increasing the anodizing temperature. Also, sealing in boiling water and dichromate contributed to soft phases and coating hydration, which resulted in a decrease in hardness and wear resistance. Hardness and weight loss in the coated samples at [Formula: see text]C decreased from 460[Formula: see text]HV and 0.61[Formula: see text]mg in the samples with no sealing to 435 and 417[Formula: see text]HV and 0.72 and 0.83[Formula: see text]mg in the samples sealed in boiling water and dichromate, respectively.

scholarly journals Studies on Co-ordination Numbers of Aluminum in Aluminum Anodic Oxide Coatings

1971 ◽  
Vol 22 (8) ◽  
pp. 400-403 ◽  
Author(s):  
Toshiro TAKAHASHI ◽  
Toshihiro NAGANO ◽  
Kenji WADA ◽  
Masashi IKEGAYA ◽  
Hideo TAGAI
Keyword(s):  
Anodic Oxide ◽  
Oxide Coatings

scholarly journals The Effect of TAUNIT Carbon Nanotubes on the Properties of Electroplating and Anodic Oxide Coatings

2016 ◽  
pp. 035-042
Author(s):  
D.N. Simagin ◽  
◽  
A.A. Gravin ◽  
V.Yu. Kulakov ◽  
Yu.V. Litovka ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Anodic Oxide ◽  
Oxide Coatings

scholarly journals Determination of porous structure parameters of coal particles to describe thermal conversion processes

2019 ◽  
Vol 109 ◽  
pp. 00101
Author(s):  
Oleksandr Topal ◽  
Iryna Holenko ◽  
Inna Diakun
Keyword(s):  
Porous Structure ◽  
Gas Adsorption ◽  
Thermal Conversion ◽  
Structure Parameters ◽  
Adsorption Method ◽  
Coal Particles ◽  
Different Temperatures ◽  
Char Reactivity ◽  
Determination Of Parameters

The results of determination of parameters of porous structure of coal and char particles are presented. They were determined using gas adsorption method and thermal decomposition of particles in air oxygen. The porous structure parameters allow predicting char reactivity change at different temperatures as well as during conversion in accordance with Random Pore Model (RPM-model).

Surface area and microstructure of microwave activated crumb rubber modifier and its influence on high temperature properties of crumb rubber modifier binders

2020 ◽  
Vol 10 (2) ◽  
pp. 272-277 ◽  
Author(s):  
Bo Li ◽  
Xuwei Zhu ◽  
Xingjun Zhang ◽  
Xiaolong Yang ◽  
Xiuli Su
Keyword(s):  
High Temperature ◽  
Surface Area ◽  
Gas Adsorption ◽  
Treatment Time ◽  
Particle Surface ◽  
Microwave Treatment ◽  
Crumb Rubber ◽  
Adsorption Method ◽  
Temperature Performance ◽  
Mechanism Of Interaction

Crumb rubber pretreatment by microwave before blending with an asphalt matrix can address and improve the modification problem of of crumb rubber modifier (CRM) asphalt plant. In this research, the surface area and microstructure of microwave activated CRM and high-temperature performance of CRM asphalt were investigated to characterize the mechanism of interaction between activated CRM blends added and base asphalt. The surface area and microstructure of CRM were measured by gas adsorption method and the scanning electron microscopy (SEM) respectively when CRM was activated using microwave treatment time (30 s, 60 s, 90 s, 120 s and 150 s). The complex shear modulus (G*) and the phase angle (δ) of the CRM asphalt were measured by Dynamic Shear Rheometer (DSR) test. The results indicated that microwave treatment produced more porous structure and agglomeration phenomenon than control one for a given activated time of CRM. The flocculent structure was the most obvious one and agglomeration phenomenon was the most significant one for the particle surface microwave activated 90 s. The δ decreased and G* increased as CRM blends activated time increased before a certain time using the same frequency of microwave treatment. The G*/sinδ of CRM blends was the maximum when CRM activated for 90 s using microwave treatment. Both surface area and microstructure of the CRM influenced the high-temperature performance of CRM binders.

Sign in / Sign up

Export Citation Format

Share Document