scholarly journals Corrosion Studies on Relative Durability of Decorative Copper-Nickel-Chromium versus Nickel-Chromium Coatings on Steel

1961 ◽  
Vol 12 (4) ◽  
pp. 144-148
Author(s):  
Mamoru SAITO ◽  
Minoru NAKAMURA
Keyword(s):  
Copper Nickel ◽  
Nickel Chromium ◽  
Corrosion Studies

scholarly journals Electrodeposition of Thick and Crack-Free Fe-Cr-Ni Coatings from a Cr (III) Electrolyte

Coatings ◽  
2022 ◽  
Vol 12 (1) ◽  
pp. 56
Author(s):  
Vanessa Meinhold ◽  
Dominik Höhlich ◽  
Thomas Mehner ◽  
Thomas Lampke
Keyword(s):  
Direct Current ◽  
Deposition Method ◽  
X Ray Diffraction ◽  
Chromium Vi ◽  
Nickel Chromium ◽  
Corrosion Studies ◽  
Iron Nickel ◽  
Hard Chrome ◽  
Scratch Tests ◽  
Economical Alternative

The electrodeposition of iron-nickel-chromium coatings is a more environmentally friendly and economical alternative to hard-chrome coatings made from chromium (VI) electrolytes and stainless-steel bulk materials. The aim of the study was to develop a suitable deposition method for thick and low-crack Fe-Cr-Ni coatings. Iron-nickel-chromium coatings were electrodeposited using a more ecological chromium (III) electrolyte with direct current (DC), stepped direct current, and pulse current (PC). The influence of the deposition method on the electrolyte aging, the alloy composition of the coating, and their microstructure was investigated. Corrosion studies of the Fe-Cr-Ni coatings in 3.5% NaCl solution were performed using polarization tests. Furthermore, hardness measurements and scratch tests were carried out to determine the adhesion strength. Phase analyses were performed by X-ray diffraction, and the chemical composition and microstructure were characterized by scanning electron microscopy. Using the stepped DC and PC method, crack-free Fe-Cr-Ni coatings were successfully deposited.

Thermogravimetric Thin Aqueous Film Corrosion Studies of Alloy 22; Calcium Chloride Solutions at 150°C and Atmospheric Pressure

2002 ◽  
Vol 757 ◽  
Author(s):  
Phillip Hailey ◽  
Greg Gdowski
Keyword(s):  
Weight Loss ◽  
Calcium Chloride ◽  
Specimen Surface ◽  
Tungsten Alloy ◽  
Corrosion Resistant ◽  
Nickel Chromium ◽  
Corrosion Studies ◽  
Alloy 22 ◽  
Post Test

ABSTRACTThe extent of reaction of alloy 22 with limited amounts of aqueous calcium chloride (CaCl2) was investigated. Alloy 22 is a highly corrosion-resistant nickel-chromium-molybdenum-tungsten alloy. Specimens were polished to a mirror finish prior to aerosol salt deposition. An aqueous film was formed on the specimen surface by deliquescence of deposited CaCl2 at 150°C and 22.5% relative humidity (RH). The reactant gas was a continuous flow of purified humidified laboratory air. The reaction progress as a function of time was continuously measured in-situ by a microbalance. An initial weight gain due to CaCl2 deliquescence was observed. A steady weight loss was observed over the next 24 hours, after which no further weight change was apparent. During the period of weight loss, white precipitates formed and the specimen surface became visibly dry. Post-test analyses indicated that the precipitates consisted of calcium, chloride, and oxygen.

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