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.

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.

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.

scholarly journals Study on the Corrosion Mechanism of Zn-5Al-0.5Mg-0.08Si Coating

2011 ◽  
Vol 2011 ◽  
pp. 1-5 ◽  
Author(s):  
Shiwei Li ◽  
Bo Gao ◽  
Ganfeng Tu ◽  
Yi Hao ◽  
Liang Hu ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Salt Spray ◽  
Microstructural Characterization ◽  
Alloy Coating ◽  
Salt Spray Test ◽  
Corrosion Mechanism ◽  
Neutral Salt ◽  
Test Results ◽  
Coating Surface ◽  
New Type

A new type of hot-dip Zn-5Al-0.5Mg-0.08Si and Zn-5Al alloy coatings was performed on the cold rolled common steel. The hot-dip process was executed by self-made hot-dip galvanising simulator. SEM and EDS test results demonstrated that Mg was mainly distributed in crystal boundaries. XRD test results showed that the corrosion product of Zn-5Al-0.5Mg-0.08Si alloy coating was almost Zn5(OH)8C12⋅H2O. The features of Zn5(OH)8C12⋅H2O are low electric conductivity, insolubility and good adhesion.The corrosion resistance of alloy-coated steels was detected by neutral salt spray test. The microstructural characterization of the coating surface after neutral salt spray test and removing the corrosion products revealed that the corrosion process of Zn-5Al-0.5Mg-0.08Si coating was uniform and the coating surface was almost flat. As a result, the corrosion resistance of Zn-5Al-0.5Mg-0.08Si coating has a remarkable improvement with a factor of 9.2 compared with that of Zn-5Al coating.

scholarly journals Ultrasonic Sensors-Assisted Corrosion Studies on Surface Coated AlSi9Cu3 Alloy Die Castings

Coatings ◽  
2020 ◽  
Vol 10 (1) ◽  
pp. 85
Author(s):  
Yuh-Chung Hu ◽  
Senthil Kumaran Selvaraj ◽  
Manivannan Subramanian ◽  
Kathiravan Srinivasan ◽  
Srinivasan Narayanan
Keyword(s):  
Corrosion Resistance ◽  
Die Casting ◽  
Pure Aluminum ◽  
Salt Spray ◽  
Salt Spray Test ◽  
Al Alloy ◽  
Neutral Salt ◽  
Powder Coatings ◽  
Acrylic Paint ◽  
Epoxy Primer

A novel phenomenon known as Industry X.0 is becoming extremely popular for digitizing and reinventing business organizations through the adaption of rapid and dynamic technological, innovational, and organizational changes for attaining the profitable revenue. This work investigates the die-casted commercially pure aluminum alloyed with 9% silicon and 3% copper (AlSi9Cu3) that is produced through the gravity die casting process. Further, the degradation of surface coating on die-casted AlSi9Cu3 alloy was explored. The acrylic paint electrodeposition (ED) coat, 2-coat polyester without primer and 3-coat polyester with epoxy primer powder coatings were used in this study. Moreover, the 3.5 wt.% of sodium chloride (3.5 wt.% of NaCl) test solution was used for electrochemical and salt spray test and the tools used to assess electrochemical properties were electrochemical impedance spectroscopy (EIS), potentiodynamic polarization, and neutral salt spray test (NSS). The microstructure of AlSi9Cu3 after corrosion exposure was investigated; also, the microstructure of coated and uncoated AlSi9Cu3 samples was analyzed by SEM microscopy after corrosion exposure. Besides, the electrochemical studies were also carried out on the Al alloy die casting. It was found that acrylic paint ED coatings exhibited higher corrosion resistance than 2-coat polyester without primer & 3-coat polyester with epoxy primer powder coatings. Acrylic paint ED coating showed higher corrosion resistance in AC and a lower value in DC and 3-coat polyester with epoxy primer powder coating displayed higher corrosion resistance in DC and a lower value in AC.

Research on Heavy-Duty Coating Protection System of Magnesium Alloy

2015 ◽  
Vol 1119 ◽  
pp. 525-528
Author(s):  
Ru Tang Yan ◽  
Yuan Yuan Li ◽  
Chun Wei She ◽  
Hua Geng Li ◽  
Hua Pan Li
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Salt Spray ◽  
Salt Spray Test ◽  
Protection System ◽  
Test Time ◽  
Test Results ◽  
Ageing Test ◽  
Micro Arc Oxidation ◽  
Resistance Performance

The poor corrosion resistance of magnesium alloys become the bottleneck restricting its development. Based on micro-arc oxidation (MAO) technology and the characteristics of fluorocarbon coating the surface of magnesium alloy build a high corrosion protection system, namely: Based on micro-arc oxidation coating fluorocarbon coatings. The formation of the composite coating through the resistance to ageing test through the resistance to ageing test, acid and alkali experiment and salt spray test results show the excellent corrosion resistance performance. Among them, the resistance to salt spray test time can reach 1500 h, which breaks the bottleneck of magnesium alloy corrosion resistance of 1000 h.

scholarly journals RESISTÊNCIA A CORROSÃO EM DIFERENTES TRATAMENTOS DE SUPERFÍCIE SOBRE LIGAS DE ZINCO UTILIZADOS EM METAIS SANITÁRIOS

2019 ◽  
Vol 10 (2) ◽  
pp. 185
Author(s):  
Suzan Arnold ◽  
Sandra Raquel Kunst ◽  
Luciane Taís Fuhr ◽  
Cláudia Trindade Oliveira
Keyword(s):  
Mechanical Properties ◽  
Corrosion Resistance ◽  
Lower Cost ◽  
Salt Spray ◽  
Aggressive Medium ◽  
Salt Spray Test ◽  
High Porosity ◽  
Ferrous Alloys ◽  
Copper Nickel

Entre as ligas não ferrosas, as ligas de zamac são as mais utilizadas para a fundição e vêm sendo aplicadas na substituição de peças de latão, utilizadas industrialmente em metais sanitários. O zamac apresenta propriedades mecânicas semelhantes às do latão, porém com custo inferior. Entretanto, a alta porosidade destas ligas, impede que tratamentos superficiais garantam bom acabamento e resistência à corrosão. Visando melhorar o desempenho, frente à corrosão de peças de zamac, o objetivo do presente trabalho é avaliar o processo de diferentes tratamentos de superfície dos metais sanitários produzidos em zamac. As amostras foram injetadas sobre pressão e submetidas a diferentes tratamentos superficiais (tratamento mecânico, tratamento químico, cobre alcalino, cobre ácido, níquel, cromo). Os corpos de prova foram expostos a um meio agressivo, por meio de nevoa salina a fim de analisar a resistência à corrosão das peças, além de análises de polarização, metalografia e microdureza. Observou-se que a maior incidência de corrosão ocorreu nas partes de injeção e solda da peça, as amostras tratadas com níquel e cromo demonstraram o melhor desemprenho frente a resistência a corrosão.Palavras-chave: Zamac. Metais sanitários. Corrosão.ABSTRACTAmong the non ferrous alloys, zamak are the most used for casting and have been applied to substitute brass parts, industrially utilized in sanitary metals. The zamak presents mechanical properties similar to brass, however with lower cost. Meanwhile, the high porosity of these alloys hinders the superficial treatments ensure good finishing and corrosion resistance. Aiming to improve the performance against corrosion of zamak parts, this work evaluates the process of different superficial treatments of sanitary metals produced with zamak. The samples were injected under pressure and submitted to different superficial treatments (mechanical, chemical, alkaline copper, acid copper, nickel and chromium). The specimens were exposed to an aggressive medium through salt spray test to evaluate the corrosion resistance, and the following analysis: polarization, metallography and microhardness. It was observed that the higher corrosion incidence occurred on the injection and weld regions. The samples treated with nickel and chromium demonstrated better performance of corrosion resistance. Keywords: Zamak. Sanitary materials. Corrosion.

The mechanical properties and corrosion resistance of selective laser melting 30CrMnSiA steel

2020 ◽  
Vol 67 (6) ◽  
pp. 575-581
Author(s):  
Haoyue Zhang ◽  
Luqi Chang ◽  
Hongwei Zhang ◽  
Junyan Li ◽  
Zijiang Yang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Selective Laser Melting ◽  
Salt Spray ◽  
Salt Spray Test ◽  
Test Time ◽  
Laser Melting ◽  
Content Type ◽  
Corrosion Behaviors ◽  
Immersion Experiment ◽  
Mechanical Properties And Corrosion

Purpose The purpose of this paper is to study the mechanical and corrosion behaviors of selective laser melting (SLM) 30CrMnSiA steel. Design/methodology/approach The microstructure, mechanical behavior and corrosion resistance of SLM 30CrMnSiA steel were studied by electrochemical test and immersion experiment. Findings The results showed that the microstructure of SLM 30CrMnSiA steel contained equiaxed fine (25.0 µm) ferrite and lamellar pearlite. The tensile strength of SLM 30CrMnSiA steel under the process parameters is 1,447 MPa and the elongation is 7.5%. As the immersion/salt spray test time increased to 15 days/48 h, corrosion mainly occurred in the local position of the sample and corrosion resistance decreased. When the immersion/salt spray test time increased to 30 days/168 h, the corrosion production covered the surface of the samples and the corrosion resistance increased. Originality/value The paper can guide the application and in situ repair for low-alloy steel by additive manufacturing.

scholarly journals Comparative Study on the Corrosion Resistance of Inorganic Zinc-Rich Coating and Thermal-Spray Zinc Coating

2021 ◽  
Author(s):  
Weiliang Ni ◽  
Peng Li ◽  
Yajun Zhu ◽  
Zhigang Di ◽  
Liangliang Guo ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Thermal Spray ◽  
Salt Spray ◽  
Zinc Coating ◽  
Steel Structures ◽  
Salt Spray Test ◽  
Shielding Effect ◽  
Corrosion Mechanism ◽  
Time Varying ◽  
Zinc Coatings

Abstract The corrosion resistance of two steel coatings (inorganic zinc-rich coating and thermal-spray zinc coating) was studied in detail by using the electrochemical and salt spray test, and the salt spray corrosion thickness was calculated by the time-varying equation established from the mathematical fitting method. The result show that the corrosion mechanism of the two types of coatings was the same that based on the sacrificed of zinc through anodizing phenomenon. The main reason for the difference of corrosion resistance between the two anticorrosive coatings was that the coating density and shielding effect of corrosion products were different. The 7500-hours salt spray test showed that the corrosion rates and microstructure characteristics of both types of zinc coatings were homogeneous on the premise of ensuring coating reliability. The time-varying equation can be used to evaluate the service life of the zinc coatings and judge their corrosion resistance quickly, that providing theoretical support for the maintenance of steel structures as well as the accelerated selection and design of coating formulations.

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 Enhancement of Corrosion Resistance of Aluminum 7075 Surface through Oil Impregnation for Subsea Application

2019 ◽  
Vol 9 (18) ◽  
pp. 3762 ◽  
Author(s):  
Youngkyun Seo ◽  
Jung-Yeul Jung ◽  
Jihoon Chung ◽  
Sangmin Lee
Keyword(s):  
Contact Angle ◽  
Corrosion Resistance ◽  
Electronic Device ◽  
Salt Spray ◽  
Contact Angles ◽  
Salt Spray Test ◽  
Cylindrical Shape ◽  
Pressure Test ◽  
Oil Impregnation ◽  
Aluminum 7075

This study investigated the corrosion resistance of oil impregnated anodic aluminum oxide (AAO) surfaces of aluminum 7075 for subsea application. Although aluminum 7075 has high strength, it is scarcely used in the subsea industry because of its corrosion issue. Some treatment of aluminum 7075 is required for subsea application. In this study not only a plate shape but also a cylindrical shape were investigated because a cylindrical shape is frequently used in the subsea industry for electronic device housing. Contact angles of bare aluminum and oil impregnated AAO surfaces of aluminum 7075 were measured after a salt spray test and a pressure test. The results showed that the contact angle of bare aluminum was considerably decreased after the salt spray test, whereas the oil impregnated AAO surface presented a relatively high contact angle after the salt spray test and the pressure test. These results showed that the corrosion resistance of aluminum 7075 could be enhanced by oil impregnation on the AAO surface, and thus can be utilized in the subsea industry.

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