Study on the electrochemical behaviour of 22k gold (Au-5.8wt.%Cu-2.5wt.%Ag) and Ti containing 22k gold (Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti)

IF 2.2 4区 工程技术 Q2 Chemistry Gold Bulletin Pub Date : 2019-11-15 DOI:10.1007/s13404-019-00263-z
K. M. Saradesh, Indrajit Patil, D. Sivaprahasam, Bhalchandra Kakade, G. S. Vinodkumar
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引用次数: 1

Abstract

The electrochemical corrosion behaviour of 22k gold (Au-5.8wt.%Cu-2.5wt.%Ag) and Ti containing 22k (Ti-22k) gold (Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti) was studied. Elemental Ti was added as the quaternary element to 22k gold by replacing Ag, resulting in the formation of secondary phase precipitates during age hardening treatment, thereby improving the hardness of the alloy. Anodic polarization tests were conducted for both 22k and Ti-22k samples in their as-cast annealed, cold-rolled annealed and age-hardened conditions using 0.9% sodium chloride and 1% lactic acid as medium. The as-cast and annealed 22k samples showed better corrosion resistance in both corrosion media whereas the 22k samples in the cold-rolled, annealed condition and Ti-22k samples in the as-cast, annealed condition showed poor corrosion resistance. After age-hardening treatment, cold-rolled Ti-22k samples showed better corrosion resistance due to the formation of passive layer (of TiO2) on the surface. However, corrosion gets initiated in the age-hardened Ti-22k due to the breaking and decomposition of the passive layer (TiO2) at a potential > 1.3 V.

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22k金(Au-5.8wt.%Cu-2.5wt.%Ag)和含钛22k金(Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti)的电化学行为研究
研究了22k金(Au-5.8wt.%Cu-2.5wt.%Ag)和含Ti的22k (Ti-22k)金(Au-5.8wt.%Cu-2.0wt.%Ag-0.5wt.%Ti)的电化学腐蚀行为。在22k金中加入元素Ti代替Ag作为第四元元素,时效硬化过程中形成二次相沉淀,提高了合金的硬度。以0.9%氯化钠和1%乳酸为介质,对22k和Ti-22k试样在铸态退火、冷轧退火和时效硬化条件下进行阳极极化试验。铸态和退火态的22k样品在两种腐蚀介质中的耐蚀性都较好,而冷轧退火态的22k样品和铸态退火态的Ti-22k样品的耐蚀性较差。经过时效硬化处理的冷轧Ti-22k样品,由于表面形成了钝化层(TiO2),具有较好的耐蚀性。然而,时效硬化的Ti-22k由于钝化层(TiO2)在电位>下断裂和分解而产生腐蚀;1.3 V。
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来源期刊
Gold Bulletin
Gold Bulletin 工程技术-材料科学:综合
CiteScore
3.30
自引率
4.50%
发文量
0
审稿时长
3 months
期刊介绍: Gold Bulletin is the premier international peer reviewed journal on the latest science, technology and applications of gold. It includes papers on the latest research advances, state-of-the-art reviews, conference reports, book reviews and highlights of patents and scientific literature. Gold Bulletin does not publish manuscripts covering the snthesis of Gold nanoparticles in the presence of plant extracts or other nature-derived extracts. Gold Bulletin has been published over 40 years as a multidisciplinary journal read by chemists, physicists, engineers, metallurgists, materials scientists, biotechnologists, surface scientists, and nanotechnologists amongst others, both within industry and academia. Gold Bulletin is published in Association with the World Gold Council.
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