scholarly journals Corrosion resistance of surface-conditioned 301 and 304 stainless steels by salt spray test

2021 ◽  
Vol 15 (2) ◽  
pp. 9-19
Author(s):  
Temitope Olumide Olugbade ◽  
Babatunde Olamide Omiyale
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Stainless Steels ◽  
Salt Spray ◽  
Salt Spray Test ◽  
Distilled Water ◽  
Similar Reduction ◽  
Lower Weight ◽  
Mechanical Attrition ◽  
Before And After

The corrosion rate of surface-conditioned 301 and 304 stainless steels (SS) was determined by salt spray test in a controlled accelerated corrosive medium (9.5 L of pure distilled water + 500 g NaCl). By surface conditioning via mechanical attrition treatment, a gradient-structured layer was firstly generated on the surface of the samples before the salt spray test. The corrosion rate was determined by the weight loss before and after the salt spray test. Compared to the untreated 301 SS sample with a weight loss of 0.15 g, the surface-conditioned samples treated for 300 s and 1200 s experienced a lower weight loss of 0.04 and 0.02 g, respectively. A similar reduction in weight loss was achieved for 304 SS sample when treated for 5, 10, and 20 mins.

scholarly journals Evaluation of the Corrosion Rate of Aluminum 6063 in Petrol, Kerosene and Water

2018 ◽  
Vol 2 (1) ◽  
pp. 19-27
Author(s):  
N. O. Adekunle ◽  
P. O. Aiyedun ◽  
S. I. Kuye ◽  
R. O. Adetunji
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Optical Microscope ◽  
Distilled Water ◽  
Metallic Materials ◽  
Three Samples ◽  
Weight Loss Method ◽  
The Media ◽  
Average Corrosion Rate ◽  
Loss Method

The unparalleled combinations of properties of aluminum and its alloy makes aluminum one of the most versatile, economical, and attractive metallic materials for a broad range of uses. This study was carried out to evaluate the influence of kerosene, petrol and water on the corrosion performance of three samples of aluminum 6063 alloy (A and B sourced locally while sample C is an imported material). The corrosion rate was determined both by weight loss and Potentiostatics method, and the microstructure of the samples after five weeks of immersion also was examined with the aid of an optical microscope. Samples A, B and C were immersed in the media for five (5) weeks duration. The cumulative corrosion rate was measured at the end of each week. The average corrosion rates using the weight loss method for A in petrol, kerosene and distilled water were 3.100E-4, 4.905 E-4 and 6.205 E-4; for B were 4.367 E-4, 2.703 E-4 and 2.147 E-4; and those of C were 4.550 E-4, 2.257 E-4 and 1.633 E-4 respectively. Similarly, the average corrosion rate using Potentiostatics method of A in petrol, kerosene and distilled water were 0.586E-3, 0.643E-3 and 0.454E-3; for B were 0.206E-3, 0.197E-3 and 0.298E-3; and those of C were 0.183E-3, 0.232E-3 and 0.407E-3 respectively. The average result showed that Sample A had the highest corrosion rate. The media which corroded the samples the most was petrol.

scholarly journals CORROSION BEHAVIOR STUDY OF STEEL POLE IN DIFFERENT COATING TECHNOLOGY

2021 ◽  
Vol 5 (9) ◽  
Author(s):  
Nurul Shuhada Pauzai ◽  
Nor Diana Ruszaini Mohd Zin ◽  
Khairuddin Abdullah ◽  
Mithila Seva Bala Sundaram
Keyword(s):  
Corrosion Rate ◽  
Water Absorption ◽  
Salt Spray ◽  
Salt Spray Test ◽  
Accelerated Ageing ◽  
Coating Technology ◽  
Ageing Test ◽  
Behavior Study ◽  
Water Absorption Test ◽  
Corrosion Of Steel

—Corrosion of steel pole is a serious issue as they used steel pole to support overhead power line in distribution. A lot of money and time are spent for maintenance and repair of existing steel pole. This paper presents investigation on various coating technologies of steel pole for initial corrosion activity. Five types of coating were used on steel samples; epoxy, VEF polyglass, galvanized, epoxy galvanized and polyglass galvanized. The accelerated ageing test, salt spray test and water absorption test were used to determine coating degradation and severity of corrosion process. It was found that, the corrosion rate for epoxy galvanized and VEF polyglass galvanized were higher as the samples were undergoing accelerated ageing test. While VEF polyglass steel showed higher percentage of weight loss during salt spray test. In addition, the results of water absorption behavior showed that epoxy steel gave higher average of absorption rate. The results obtained lead to low degradation of coating as the corrosion rate seem to be uniform

scholarly journals The effects of tryptophan and pyridoxine supplied orally to nursing piglets on weight loss and social behavior after weaning

2021 ◽  
pp. 335-346
Author(s):  
Lucas Pimentel Bonagurio ◽  
◽  
Leandro Dalcin Castilha ◽  
Tiago Junior Pasquetti ◽  
Cleiton Pagliari Sangali ◽  
...  
Keyword(s):  
Weight Loss ◽  
Social Behavior ◽  
Block Design ◽  
Experimental Unit ◽  
Distilled Water ◽  
Oral Supplementation ◽  
Randomized Block Design ◽  
Before And After ◽  
Suckling Piglets ◽  
High Doses

This study evaluated the effect of oral supplementation with tryptophan (Trp) and pyridoxine (Pyr) on the growth performance and social behavior of suckling piglets before and after weaning. At day 14, six suckling piglets per sow were distributed into three treatments and allotted in a randomized block design, with eight replicates and two piglets per experimental unit. Treatments consisted of a Control - oral supplementation with L-alanine (1.70 g), D-glucose (1.74 g) and distilled water (3.44 mL); Trp - oral supplementation with Trp (3.5 g/d) and distilled water; and Trp + Pyr - oral supplementation with Trp (3.5 g/d) + Pyr (0.0095 g/d) and distilled water. Each treatment was supplied orally five times per day (2.5 mL each treatment), from 14 to 21 days old. Piglets were monitored continuously in the nursing phase for 24 h at 21, 28 and 33 days of age to assess the behavior (standing, lying, eating, socializing, sitting and drinking). Piglets receiving oral Trp + Pyr showed a decreased weight loss on the first day after weaning (P = 0.03). Performance was not affected (P > 0.05) by treatments in each studied period, such as in overall period (21 to 34 days) after weaning. Piglets receiving Trp supplementation visited the feeders more frequently from days 21 to 22 (P < 0.01) and from days 28 to 29 (P < 0.02), as well as in the overall period (P < 0.01). It is concluded that high doses of tryptophan with or without high doses of pyridoxine, supplied orally to nursing piglets, reduced the weight loss on the first day after weaning and increased the frequency of visits to the drinkers on the first day after weaning and also to the feeders, mainly from weaning until 7 days after.

scholarly journals Weight loss of five commercially available denture teeth after toothbrushing with three different dentifrices

2006 ◽  
Vol 14 (4) ◽  
pp. 242-246 ◽  
Author(s):  
Karina Matthes de Freitas ◽  
Helena de Freitas Oliveira Paranhos
Keyword(s):  
Weight Loss ◽  
Abrasion Resistance ◽  
Acrylic Resin ◽  
Control Group ◽  
Distilled Water ◽  
Test Analysis ◽  
Abrasion Test ◽  
Before And After ◽  
Main Component ◽  
Artificial Teeth

Brushing is the most common cleansing method employed on complete dentures and it may damage the integrity of acrylic resin, the main component of this type of prosthesis. This study evaluated the abrasion resistance of artificial teeth with different number of acrylic layers, and the abrasiveness of specific and non-specific dentifrices for denture cleaning. The abrasion test was conducted by a tooth brushing device, using soft toothbrushes under load (200g). Sixty artificial teeth specimens were manufactured, 12 from each brand: Vipi-Dent Plus (Dental Vipi), Trubyte Biotone (Dentsply), Trilux (Ruthinium), Ivostar (Ivoclar) and SR Vivodent PE (Ivoclar). Three brands of dentifrices were selected: Colgate (Colgate-Palmolive), Bonyplus (Bonyf AG) and Dentu-Creme (Dentco). Distilled water was used as control. The brushing time was 100 minutes, at 356 strokes/minute. The specimens were weighed on an analytical balance before and after the abrasion test. Analysis of dentifrices' abrasive particles was made by scanning electron microscopy (SEM). Two-way ANOVA and Tukey tests were employed (alpha=0.05). The general mean of weight loss values were obtained: 6.1 mg (Ivostar); 6.0 mg (Trilux); 5.9 mg (Trubyte); 5.8 mg (Vipi); 5.3 mg (Vivodent). The abrasiveness difference among teeth brands was not statistically significant. The Colgate dentifrice produced the greatest weight reduction (10.1 mg), followed by Dentu-Creme (7.6 mg). Bonyplus was the least abrasive (2.4 mg), similar to the distilled water used as control group (3.1 mg) (p=0.05). It was concluded that all acrylic teeth presented similar abrasion resistance. Specific dentifrices for dentures tend to cause less damage to acrylic resin.

Characterization of Microstructure, Phase Composition and Corrosion Resistance of Al-Zn-Si-RE Waterborne Coatings

2014 ◽  
Vol 887-888 ◽  
pp. 1076-1079
Author(s):  
Qiong Jiang ◽  
Qiang Miao ◽  
Wen Ping Liang ◽  
Bei Lei Ren ◽  
Yi Xu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Phase Composition ◽  
Corrosion Rate ◽  
Steel Substrate ◽  
Salt Spray ◽  
Corrosion Layer ◽  
Salt Spray Test ◽  
Aluminum Coatings ◽  
Lower Corrosion Rate ◽  
Evolution Of Microstructure

New waterborne Al-Zn-Si-RE coatings with improved corrosion resistance were introduced in this study. The corrosion resistance of Al-Zn-Si-RE coatings was evaluated by electrochemical measurements and salt spray test. Evolution of microstructure and phase composition at different exposure time in salt spray test was investigated by scanning electron microscopy and X-ray diffraction technique. The results indicate that Al-Zn-Si-RE coatings provide effective sacrificial protection to the steel substrate but exhibit lower corrosion rate and higher corrosion resistance compared to zinc aluminum coatings. The dense continuous corrosion layer formed on Al-Zn-Si-RE coating acts as a barrier layer, limiting the transport of aggressive species towards the coating-substrate interface and the corrosion rate of the coating; Zinc aluminum hydroxy carbonates are the dominant components in the corrosion layer of Al-Zn-Si-RE coatings.

scholarly journals Adsorption behavior and corrosion rate model of sodium carboxymethyl cellulose (Na-CMC) polymer on aluminium in HCl solution

2020 ◽  
Vol 39 (2) ◽  
pp. 369-378
Author(s):  
O.M. Egbuhuzor ◽  
I.C. Madufor ◽  
S.C. Nwanonenyi ◽  
J.O. Bokolo
Keyword(s):  
Weight Loss ◽  
Corrosion Rate ◽  
Carboxymethyl Cellulose ◽  
Water Bath ◽  
Sodium Carboxymethyl Cellulose ◽  
Time Interval ◽  
Adsorption Behaviour ◽  
Before And After ◽  
The Difference ◽  
Cr Concentration

Adsorption behaviour and corrosion rate of Sodium carboxymethyl cellulose on aluminium was studied. Different concentration levels of Sodium carboxymethyl cellulose (Na-CMC) solution were applied on several prepared and polished aluminium coupons for a corrosion experiment. These coupons were totally immersed in 100ml of 0.5M solution of Hydrochloric acid (HCl) in an open beaker placed in a water bath at varying temperatures for 2-8hrs respectively. At every specified temperature and time interval, the immersed coupon specimen was withdrawn from the test solution, washed, dried and reweighed. The weight loss being the difference in weight of the specimen before and after immersion in the water bath was recorded for every coupon sample. The effects of concentration, temperature and time on corrosion rate were studied and from the various plots, it was observed that increase in the concentration of the inhibitor decreases the corrosion rate. The study of the adsorption behaviour showed that Na-CMC was physically adsorbed on the aluminium coupons and obeyed Freundlich adsorption isotherm with an activation energy of 32K.83j/mol and heat of adsorption of -18.21Kj/mol . The study also established a relationship between the corrosion rate, CR; concentration, C; temperature, T; and time t, through a mathematical model: CR = 3.8-5*T1.1617 - 0.00052t0.6176 - 0.0013C0.8012, the proportion of variance explained (R2) = 0.8658 (86.58%), From the Results of the experiment and the model, Na-CMC was found to be an active corrosion inhibitor of Aluminium in acidic environment. Keywords: Adsorption, Aluminium, concentration, Corrosion Rate, Weight Loss

An EIS Study of the Corrosion Behavior of Arc Spraying Al-RE Coating in Salt Spray Test

2011 ◽  
Vol 236-238 ◽  
pp. 1645-1648 ◽  
Author(s):  
Yi Liu ◽  
Shi Cheng Wei ◽  
Yu Jiang Wang ◽  
Bin Shi Xu
Keyword(s):  
Corrosion Behavior ◽  
Electrochemical Impedance ◽  
Salt Spray ◽  
Resistance Mechanism ◽  
Low Frequency ◽  
Salt Spray Test ◽  
Arc Spraying ◽  
Second Stage ◽  
Spectral Changes ◽  
Before And After

The corrosion behavior of Al-RE coating in copper accelerated acetic acid salt spray test (CASS) was studied by electrochemical impedance spectroscopy (EIS). Typical EIS spectral changes were clearly observed during the CASS process. The EIS was shown to be a very useful tool for studying corrosion resistance mechanism. Scanning electron microscope and X-ray energy dispersive spectroscopy were used to analyze the microstructure of Al-RE coatings before and after CASS test. The results revealed that the corrosion behavior of Al-RE coating could be divided into two different stages. In the first stage of CASS, there were two capacitive impedance semicircles in the complex plane plots. The high frequency semicircle responded to barrier layer, the low frequency semicircle responded to the electrochemical reaction of Al-RE coating. In the second stage of CASS, porous layer began to influence the electrochemical behavior.

Research on the Performance of Shielded Wire Passivated by 823 Preservatives in Neutral Salt Spray Test

2014 ◽  
Vol 556-562 ◽  
pp. 3-5
Author(s):  
Ke Shun Dai ◽  
Wen Kai Xiao ◽  
Tan Yu
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Polarization Curve ◽  
Salt Spray ◽  
Corrosion Cracking ◽  
Salt Spray Test ◽  
Normal Operation ◽  
Neutral Salt

The corrosion cracking of Shielded wire could result in protection equipments and automatic devices failing to work, which seriously affects the normal operation of the grid [1]. Therefore, researching the corrosion of Shielded wire has an important meaning. This article, through measurements of the polarization curve of the shield, researched the corrosion rate of different spray time and treatments, and came to a conclusion that the corrosion resistance after passivated by 823 preservatives is higher than before it.

Corrosion Resistance of the Nanometer Organic Coating in Grotto Environment

2014 ◽  
Vol 1004-1005 ◽  
pp. 768-773
Author(s):  
Miao Lou ◽  
Yu Feng Lu ◽  
Meng Zhou ◽  
Fei Lu ◽  
Yin Jun Huang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Corrosion Rate ◽  
Salt Spray ◽  
Organic Coating ◽  
Salt Spray Test ◽  
Coating Surface ◽  
Good Protection

Accelerate the corrosion of the nanometer organic coating by design salt spray test. Research the corrosion resistance of the nanometer organic coating in grotto environment by EIS. The results show that prolong time of the salt spray test, the coating surface become to coarseness, the colour occur slight change, but no blistering and flake away. The Rc and Rt descend, every ten days the corrosion rate of coating augment decuple, at forty days is 3.14μm/a and the steel is not corrosion. The nanometer organic coating behave good protection ability and corrosion resistance in the grotto environment.

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