Application of Zinc-Rich Lithium-Silicate Coatings on the Corrosion Prevention of Steel

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基本資料

Project title

Code/計畫編號

NSC96-2622-E019-004-CC3

Translated Name/計畫中文名

矽酸鋰富鋅塗料應用於鋼材之防蝕技術研發

Project Coordinator/計畫主持人

Jiang-Jhy Chang

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

葉為忠

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=1400410

Year

2007

Start date/計畫起

01-05-2007

Expected Completion/計畫迄

01-04-2008

Co-Investigator(s)

Wei-Chung Yeih

Bugetid/研究經費

413千元

ResearchField/研究領域

土木水利工程
材料科技

無機矽酸鹽富鋅塗料最早是由美國太空總署（NASA）於 1970 年代，為了保護火箭發射台鋼結構免於腐蝕開發而成的。此種塗料使用無機矽酸鹽類當做成膜物質添加大量鋅粉為顏料，固化後形成堅硬耐磨並具陰極防蝕性能之高性能防蝕塗膜，且使用過程不揮發有機化合物，符合環保要求。因其擁有以上諸多優點，使得無機矽酸鹽富鋅塗料深具開發潛力及研究價值。本研究旨在探討不同的矽酸鋰模數與鋅粉比對塗層造膜性能之影響，且對塗封後鋼材進行防蝕、耐候性能測試，並探討其防蝕機理。量測指標主要針對塗膜之工作性、造膜性、機械性能、耐蝕性及耐候性進行評比，所使用試驗方法包括乾燥時間及膜厚的量測、硬度試驗、附著性試驗、巨觀腐蝕觀察、開路電位、腐蝕速率、微觀觀察及腐蝕產物化性分析等。研究結果顯示，鋅粉比對塗膜之工作性及造膜性影響甚大，過低之鋅粉比會因顏料不足而產生龜裂、爆皮及剝落；鋅粉比過高則造成工作性能下降、難以攪拌、塗刷困難及塗層不平整等缺點。而模數會對塗膜之機械性能及陰極防蝕持久性產生影響。較低模數的矽酸鋰可以獲得較好之厚度、硬度、稠度及附著性，且陰極防蝕效能可維持較長之時間。In order to prevent the corrosion of the steel structure of rocket launch site, NASA developed the zinc-rich inorganic silicate coating materials during 1970. The silicate is used to form the coating and zinc powder is added as the color agent. After hardening, it becomes a hard material and can resist to mechanical erosion. In addition, it can prevent corrosion since zinc can performed as the sacrificed anode. In the process, no organic solution is used and this meets the environmental requirement. Owing to the above-mentioned merits, the zinc-rich inorganic silicate coating has a bright future and is worth studying. In this study, we evaluate the influences for different moduli of lithium silicate (LiO/SiO2) and different mass ratio of lithium silicate to zinc on the coating-forming ability, the corrosion prevention capability and durability (especially to the varying weather condition). The following factors are considered to evaluate the performance of the coating: coating-forming ability, workability, mechanical behavior, resistance to highly alkali or acid solution and weather-resistance. The experiments include setting time, coating thickness, hardness, adhesive test, corrosion, open circuit potential, linear DC corrosion rate, micro-scale analysis and chemical analysis for the corrosion product. Experiment results show that the mass ratio of lithium silicate to zinc influences the workability and coating-forming ability significantly. The coating will debond, crack as the mass ratio of lithium silicate to zinc becomes too low. When the mass ratio of lithium silicate to zinc becomes too high, the workability of coating becomes doubtful and the coating will become sticky and hard to mix such that it is difficult to put a uniform layer of coating on the surface of steel. Meanwhile, the modulus of lithium silicate (LiO/SiO2) will affect the mechanical performance of coating as well as the capability of cathodic protection. Lower modulus will have a coating with a nicer thickness, hardness, viscosity and adhesive property. In addition, the cathodic protection can last longer.

DSpace CRIS

Application of Zinc-Rich Lithium-Silicate Coatings on the Corrosion Prevention of Steel

基本資料

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