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首页> 外文学位 >Correlation studies between outdoor exposure and accelerated laboratory corrosion tests for galvanic and non-galvanic ceramic-aluminum couples.
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Correlation studies between outdoor exposure and accelerated laboratory corrosion tests for galvanic and non-galvanic ceramic-aluminum couples.

机译：电镀和非电镀陶瓷-铝对的室外暴露与加速实验室腐蚀测试之间的相关性研究。

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摘要

The objective of this research was to develop test protocols to analyze the corrosion between aluminum and ceramics in accelerated and natural-exposure corrosion tests. The focus was on correlating outdoor exposure corrosion behavior from a variety of microclimates with a series of accelerated laboratory corrosion tests for both galvanic and non-galvanic ceramic-aluminum (Al) couples. Electrolytes with varying amounts of chloride contents (0, 10, 100, 1000, 10000, and 20000 ppm chlorides) were used in the accelerated tests to improve correlation with field results. In addition, the outdoor exposure test data were used to adjust the duration of the accelerated corrosion tests so that the corrosion damage accumulated in the accelerated tests could better represent the corrosion damage accumulated in the field.;The galvanic ceramic-Al couples were those consisting of Al coupled to titanium diboride (TiB2) and boron carbide (B4C) ceramics which have resistivities of 10-5 and 101 ohm-cm, respectively. The non-galvanic couples consisted of Al coupled to silicon carbide (SiC), silicon nitride (Si3N4), and aluminum nitride (AlN) ceramics which have resistivities of 107, 1014, and 1015 ohm-cm, respectively.;Ceramics and 6061-T6 Al coupons were coupled together using 6061-T6 C-clamps. Outdoor experiments for 3, 6, and 12- month exposure periods were conducted at eight different test sites, to determine corrosion behavior for various climate and environmental conditions (i.e., rain forest, alpine, marine, volcanic, industrial, agricultural, and arid). Accelerated laboratory experiments include controlled humidity-chamber experiments and cyclic corrosion test chamber (CCTC) experiments following modified GM9540P using different chloride-containing solutions. Corrosion rates were determined at the ceramic-Al interface for the outdoor and accelerated laboratory experiments using weight loss data. Polarization experiments were conducted on 6061-T6 Al to study the governing corrosion mechanisms in different chloride solutions. Zero-resistant ammeter (ZRA) studies were conducted between 6061-T6 Al and the conductive ceramics (TiB2) inside a humidity chamber by spraying different chloride solutions in intervals of 24 hours for 5 days to simulate rain and the steady-state galvanic corrosion rates (iGalv) were observed.;Keywords: Aluminum, ceramic-aluminum couples, galvanic corrosion, crevice corrosion, accelerated corrosion tests.
机译：这项研究的目的是开发测试协议，以分析铝和陶瓷在加速腐蚀和自然暴露腐蚀测试中的腐蚀。重点是将各种微气候的户外暴露腐蚀行为与一系列针对电偶和非电偶陶瓷-铝（Al）的实验室加速腐蚀测试相关联。在加速测试中使用了氯化物含量不同的电解质（氯化物含量为0、10、100、1000、10000和20000 ppm），以改善与现场结果的相关性。此外，室外暴露测试数据用于调整加速腐蚀试验的持续时间，以使加速试验中累积的腐蚀损伤能更好地代表现场积累的腐蚀损伤。铝与二硼化钛（TiB2）和碳化硼（B4C）陶瓷耦合，其电阻率分别为10-5和101 ohm-cm。非电偶由与电阻率分别为107、1014和1015 ohm-cm的碳化硅（SiC），氮化硅（Si3N4）和氮化铝（AlN）陶瓷耦合的Al组成;陶瓷和6061-使用6061-T6 C型夹将T6 Al试样连接在一起。在八个不同的测试地点进行了3、6和12个月暴露期的户外实验，以确定各种气候和环境条件（即雨林，高山，海洋，火山，工业，农业和干旱）的腐蚀行为。加速的实验室实验包括在使用不同的含氯溶液改良的GM9540P之后进行的受控湿度试验箱实验和循环腐蚀试验箱（CCTC）实验。使用失重数据在室外和加速实验室实验的陶瓷-铝界面处确定腐蚀速率。在6061-T6 Al上进行了极化实验，以研究不同氯化物溶液中的主要腐蚀机理。零电阻电流表（ZRA）研究是在6061-T6 Al和湿度室内的导电陶瓷（TiB2）之间进行的，方法是每隔24小时喷洒不同的氯化物溶液5天，以模拟降雨和稳态电化腐蚀速率关键字：铝，陶瓷-铝对，电偶腐蚀，缝隙腐蚀，加速腐蚀试验。

著录项

  • 作者

    Srinivasan, Raghu.;

  • 作者单位

    University of Hawai'I at Manoa.;

  • 授予单位 University of Hawai'I at Manoa.;
  • 学科 Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2010
  • 页码 225 p.
  • 总页数 225
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:36:56

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