On the Wear and Corrosion Resistance of Zinc-rich Coatings on Steel Components PDF Download
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Author: Alexander John Carmichael
Publisher:
ISBN: 9780725901141
Category : Steel
Languages : en
Pages : 10
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Author: Alexander John Carmichael
Publisher:
ISBN: 9780725901141
Category : Steel
Languages : en
Pages : 10
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Book Description
Author: Xiaoge Gregory Zhang
Publisher: Springer Science & Business Media
ISBN: 9780306453342
Category : Science
Languages : en
Pages : 500
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Book Description
Humankind's use of zinc stretches back to antiquity, and it was a component in some of the earliest known alloy systems. Even though metallic zinc was not "discovered" in Europe until 1746 (by Marggral), zinc ores were used for making brass in biblical times, and an 87% zinc alloy was found in prehistoric ruins in Transylvania. Also, zinc (the metal) was produced in quantity in India as far back as the thirteenth century, well before it was recognized as being a separate element. The uses of zinc are manifold, ranging from galvanizing to die castings to electronics. It is a preferred anode material in high-energy-density batteries (e.g., Ni/Zn, Ag/Zn, ZnJair), so that its electrochemistry, particularly in alkaline media, has been extensively explored. In the passive state, zinc is photoelectrochemically active, with the passive film displaying n-type characteristics. For the same reason that zinc is considered to be an excellent battery anode, it has found extensive use as a sacrificial anode for the protection of ships and pipelines from corrosion. Indeed, aside from zinc's well-known attributes as an alloying element, its widespread use is principally due to its electrochemical properties, which include a well-placed position in the galvanic series for protecting iron and steel in natural aqueous environments and its reversible dissolution behavior in alkaline solutions.
Author: Frank C. Porter
Publisher: CRC Press
ISBN: 1482293528
Category : Mathematics
Languages : en
Pages : 534
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Book Description
A cornerstone reference in the field, this work analyzes available information on the corrosion resistance of zinc and its alloys both as solid materials and as coatings on steel, detailing the corrosion resistance of zinc in atmospheric, aqueous, underground and chemical environments. Corrosion Resistance of Zinc and Zinc Alloys illustrates the nu
Author: William J. Paton
Publisher:
ISBN:
Category : Carbon steel
Languages : en
Pages : 92
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Book Description
A program was conducted to evaluate the performance of topcoated and untopcoated zinc-rich coatings. Sacrificial coatings of this type are required for protecting carbon steel structures from the aggressive KSC sea coast environment. A total of 59 commercially available zinc-rich coatings and 47 topcoated materials were exposed for an 18-month period. Test panels were placed in special racks placed approximately 30.5 m (100 feet) above the high tide line at the KSC Corrosion Test Site. Laboratory tests to determine the temperature resistance, abrasion resistance, and adhesion of the untopcoated zinc-rich coatings were also performed. It has been concluded that: (1) The inorganic types of zinc-rich coatings are far superior to the organic types in the KSC environment. (2) Organic zinc-rich coatings applied at 0.1 - 0.15 mm (4-6 mils) film thickness provide better corrosion protection than when applied at the manufacturers' recommended nominal film thickness of .08 mm (3 mils). (3) Topcoats are not necessary, or even desirable, when used in conjunction with zinc-rich coatings in the KSC environment. (4) Some types of inorganic zinc-rich coatings require an extended outdoor weathering period in order to obtain adequate mechanical properties. and (5) A properly formulated inorganic zinc-rich coating is not affected by a 24-hour thermal exposure to 400 C (752 F).
Author: Zinc Institute, Inc
Publisher:
ISBN:
Category : Zinc coating
Languages : en
Pages : 58
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Author: C. J. Slunder
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 216
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Author: Jingyang He
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
This thesis investigates the properties of different coating systems to protect against corrosion for the steel substrate under environments of oil and gas. The coating systems were divided in two main parts according to compositions: the organic zinc and the inorganic zinc system. For each system, steel panels coated with only primers and samples coated with primers, intermediate coats and topcoats were tested. Electrochemical impedance spectroscopy (EIS) and open circuit potential (OCP) tests were used to investigate the performance of the coatings. On one side of each panel, a pinhole defect was introduced, and the tests were performed for 3 months. The two multilayer systems were then compared with TESLAN 1101 ZN-CNT low VOC epoxy primer along with topcoat. On the other side of the panels, the tests were run for 4 months to examine their performance with no defect. The solution used contained 2000 ppm of chloride concentration with a pH value of 3.5, and was refreshed weekly. For panels coated with primers only, the results showed that they all formed corrosion products, which protected the steel substrate as barriers. For panels coated with the multilayer systems and no defect, the electrolyte slowly penetrated into the coatings, but the coatings were still providing good protection against corrosion. The multilayer systems all performed better than primers only in terms of protecting steel, indicating the significance of topcoat. With pinholes, primers show very similar properties, while multilayer coating systems show that the existence of pinholes helped activate zinc as sacrificial metal. When comparing the multilayer systems with pinholes, the results show that the existence of carbo nanotube did not significantly improve the performance of coating. Among all the coating systems, inorganic zinc rich multilayer systems had the best protection against corrosion.
Author: Research Service, Incorporated
Publisher:
ISBN:
Category : Corrosion and anti-corrosives
Languages : en
Pages : 94
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Author: Imtiaz A. Taj
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Daniel James Frydrych
Publisher:
ISBN:
Category :
Languages : en
Pages : 478
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Book Description
