scholarly journals THE EFFECT OF ELECTRIC FLOW ON DECORATIVE KROM ELECTROPLATING WITH COPPER BASE METAL TOWARD CORROSION RATE

2013 ◽  
Vol 1 (2) ◽  
pp. 134
Author(s):  
Ahmadi Ahmadi ◽  
Citra Ayu Dewi
Keyword(s):  
Corrosion Rate ◽  
Electric Current ◽  
Base Metal ◽  
Copper Metal ◽  
Chemical Laboratory ◽  
Copper Base ◽  
Metal Metal ◽  
One Year ◽  
Electroplating Process ◽  
Chrome Electroplating

In this study a decorative chrome electroplating process has been carried out with a copper base metal, metal electroplating is often used as a means to provide a thin layer on the surface of other metals or substrates using metal which has advantages in terms of property and corrosion resistance. In decorative chrome electroplating nickel and chrome are used as coatings, nickel and chrome are used as coatings because of their protective and decorative properties, protective means they can prevent corrosion and decorative because they look shiny so they look attractive. Copper metal is chosen because of its huge application in the community. This study aims to measure the corrosion rate in copper metal after a decorative chrome electroplating process based on electric current used during the electroplating process. This research is important because during the electroplating process a decorative chrome electoplating technique will be obtained in the form of modules, and the module will be used to train students to increase their skills. This research was conducted in the IKIP Mataram chemical laboratory with a time of one year. The process carried out in this study sequentially is to prepare an electrolyte solution used for electroplating, preparing the copper base metal to be free of oxide or rust, nickel coating and finally coating with chrome. From the coating process carried out then the results will be analyzed the corrosion rate by immersion in NaCl solution at a concentration of 36.05 grams / L for 336 hours, based on variations in electric current used during the electroplating process of 0.5; 1; 1.5; 2; and 2.5 Ampere, the corrosion rate results were 0.029; 0.013; 0.017; 0.022; and 0.012 mm / yr; while the copper metal which is not coated with a corrosion rate is 0.308 mm / yr. Thus it can be concluded that copper metal coated with nickel chrome will effectively resist the lowest rate of corrosion in the current given 2.5 Ampere.

scholarly journals Corrosion resistance of metalized layers on steel parts in ventilation mill

10.30544/340 ◽  
2018 ◽  
Vol 24 (2) ◽  
pp. 123-132
Author(s):  
Bore V. Jegdic ◽  
Bojana M. Radojković ◽  
Biljana M. Bobić ◽  
Marija M. Krmar ◽  
Slavica Ristić
Keyword(s):  
Corrosion Rate ◽  
Base Metal ◽  
Galvanic Corrosion ◽  
Thermal Power ◽  
Electrochemical Techniques ◽  
General Corrosion ◽  
Hvof Process ◽  
The Difference ◽  
Local Dissolution ◽  
Oxygen Fuel

Corrosion behavior of metalized layers, obtained by Plasma Transferred Arc (PTA) process and by High-Velocity Oxygen Fuel (HVOF) process with the purpose to improve the wear resistance of vital parts of ventilation mill in a thermal power plant, has been tested. The test is performed using three electrochemical techniques, in a solution containing chloride and sulfate ions. It is shown that the steel surface (base metal) dissolves uniformly, without pitting or other forms of local dissolution. Morphology of metalized layers surface indicates that dissolution is non-uniform, but it still can be considered as general corrosion. The corrosion rate of base metal and metalized layer obtained by PTA process is rather low, while the corrosion rate of the metalized layer obtained by HVOF process is much higher. Also, the difference in corrosion potentials between the base metal and the HVOF layer is pretty high but slightly less than maximum allowed difference (prescribed by the standard), to avoid excessive galvanic corrosion. The values of corrosion rate obtained by different electrochemical techniques are in excellent agreement.

scholarly journals VI. On the reversal of the lines of metallic vapours

1879 ◽  
Vol 29 (196-199) ◽  
pp. 402-406 ◽  
Keyword(s):  
Electric Current ◽  
Electric Machine ◽  
Chemical Laboratory ◽  
Royal Institution ◽  
Made In

The experiments of which the results are here given were all made in the Chemical Laboratory of the Royal Institution, with the powerful electric current from the Siemens dynamo-electric machine.

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

scholarly journals Material Test Comparison of Pure Aluminum (Al) and Pure Aluminum-Coated (Al) with Silver (Ag) Substrat Using Electroplating Method

2021 ◽  
Vol 1 (2) ◽  
pp. 40-46
Author(s):  
Aming Sungkowo ◽  
Trikolas Trikolas ◽  
Rosyid Ridlo Al Hakim ◽  
Slamet Riyadi ◽  
Yanuar Zulardiansyah Arief ◽  
...  
Keyword(s):  
Electric Current ◽  
Pure Aluminum ◽  
Material Testing ◽  
Coating Process ◽  
Material Test ◽  
Large Current ◽  
Research Goal ◽  
Electroplating Process ◽  
Aluminum Material

Electroplating uses aluminum material, where it’s easy to obtain, lighter, and cheaper than other metals. The research goal was to determine the ability of the electric current to power aluminum (Al) coated with silver (Ag) by the electroplating method, to determine the effect of the magnitude of the electric current and the length of time the coating process took on the weight of Al coated with Ag and to determine the strength of the metal Al after tested using Brinnell test. The method used is to compare pure Al and pure Al coated with Ag by electroplating at different currents to determine the effect of the electroplating process. A Brinnell test was carried out to determine the hardness of the Al material after electroplating. The results are the amount of current that flows during the electroplating is directly proportional to the thickness of the electroplating layer attached to the Al surface. If the electroplating process uses a large current, the attached layer will look rough and not smooth, which also affects the material testing by using the Brinnell method. The Brinnell test proves that the hardness value of the Al material is directly proportional to the thickness of the layer.

scholarly journals Dynamics of Biocorrosion in Copper Pipes under Actual Drinking Water Conditions

Water ◽  
2020 ◽  
Vol 12 (4) ◽  
pp. 1036
Author(s):  
Carlos Galarce ◽  
Diego Fischer ◽  
Beatriz Díez ◽  
Ignacio T. Vargas ◽  
Gonzalo E. Pizarro
Keyword(s):  
Drinking Water ◽  
Corrosion Rate ◽  
Water System ◽  
Sampling Time ◽  
Blue Water ◽  
Copper Corrosion ◽  
Monitoring And Control ◽  
Microbially Influenced Corrosion ◽  
Plumbing Systems ◽  
One Year

Deficient disinfection systems enable bacteria to form in drinking water; these can invade plumbing systems even if the pipes are composed of antibacterial materials such as copper. Severe copper corrosion by microorganisms and their subsequent release into the water system are evidenced by the blue water phenomenon. Proper monitoring and control can reduce such undesirable effects on water quality. However, a lack of data from analysis under actual conditions has limited the development of useful predictive tools and preventive strategies. In this work, an experimental aging system was connected to a drinking water network affected by the blue water phenomenon. The microbially influenced corrosion (MIC) was evaluated by studying the dynamics of the formed bacterial community and its relationship with copper corrosion and the release of copper. The results suggest that the conformation and composition of the biofilm attached to the surface influence the measured parameters. The corrosion rate was variable throughout the sampling time, with the highest value recorded after one year of aging. The composition of biofilms also changed with time; however, the genus Pseudomonas was ubiquitous over the sampling time. No relationship between the corrosion rate and the biofilm age was observed, thereby suggesting that MIC is a dynamic phenomenon that requires further study.

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