Reports of studies supported by Grant-in-Aid for Research from the Graduate School of Biosphere Science, Hiroshima University

プロジェクト研究 Grant-in-Aid for Project Research ・ミャンマー沿岸における有害・有毒植物プランクトンの発生・増殖機構に関する調査研究...Su MYAT, Maung Saw Htoo THAW, 藤瀬里紗, Khin Ko LAY, 小池一彦 ・東日本大震災における水産業・漁村の復興戦略に向けた提言作り : 東アジア海域社会の地震・津波復興に関する比較研究を通じて...山尾政博 基盤研究サポート Grant-in-Aid for Fundamental Research ・大脳によらない恐怖学習 : 魚類小脳に注目して...吉田将之 ・チョコレートモデル油脂結晶の分子レベルその場観察...本同宏成 ・広島市近郊における伝統的青果物流通主体の形成・展開と産地維持機能に関する研究...細野賢治，矢野泉，高梨子文恵 ・釣り餌として海外から流通される水生動物の移入と定着に関する基礎的研究...斉藤英俊 ・低い割合で給与するイタリアンライグラスサイレージの栽培時施肥方法の違いが泌乳中・後期牛の乳生産に及ぼす影響...黒川勇

Advances in Corrosion-Resistant Thermal Spray Coatings for Renewable Energy Power Plants. Part I : Effect of Composition and Microstructure

Power generation from renewable resources has attracted increasing attention in recent years owing to the global implementation of clean energy policies. However, such power plants suffer from severe high-temperature corrosion of critical components such as water walls and superheater tubes. The corrosion is mainly triggered by aggressive gases like HCl, H2O, etc., often in combination with alkali and metal chlorides that are produced during fuel combustion. Employment of a dense defect-free adherent coating through thermal spray techniques is a promising approach to improving the performances of components as well as their lifetimes and, thus, significantly increasing the thermal/electrical efficiency of power plants. Notwithstanding the already widespread deployment of thermal spray coatings, a few intrinsic limitations, including the presence of pores and relatively weak intersplat bonding that lead to increased corrosion susceptibility, have restricted the benefits that can be derived from these coatings. Nonetheless, the field of thermal spraying has been continuously evolving, and concomitant advances have led to progressive improvements in coating quality; hence, a periodic critical assessment of our understanding of the efficacy of coatings in mitigating corrosion damage can be highly educative. The present paper seeks to comprehensively document the current state of the art, elaborating on the recent progress in thermal spray coatings for high-temperature corrosion applications, including the alloying effects, and the role of microstructural characteristics for understanding the behavior of corrosion-resistant coatings. In particular, this review comprises a substantive discussion on high-temperature corrosion mechanisms, novel coating compositions, and a succinct comparison of the corrosion-resistant coatings produced by diverse thermal spray techniques