Explication of a mechanism for the inhibitory effects of apatite on a metallic corrosion and the development of preservation concrete

• Project/Area Number: 26282096
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Social systems engineering/Safety system
• Research Institution: Kagawa University
• Principal Investigator: Kakegawa Hisao 香川大学, 工学部, 教授 (50325320)
• Co-Investigator(Kenkyū-buntansha): 末永 慶寛 香川大学, 工学部, 教授 (00284349) ; 田中 康弘 香川大学, 工学部, 教授 (10217086)
• Project Period (FY): 2014-04-01 – 2017-03-31
• Project Status: Completed (Fiscal Year 2016)
• Budget Amount: ¥6,760,000 (Direct Cost: ¥5,200,000、Indirect Cost: ¥1,560,000); Fiscal Year 2016: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000); Fiscal Year 2015: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000); Fiscal Year 2014: ¥3,640,000 (Direct Cost: ¥2,800,000、Indirect Cost: ¥840,000)
• Keywords: アパタイト / 金属腐食反応 / 防錆作用 / 鉄筋コンクリート / ヒドロキシアパタイト / アノード反応抑制 / 金属腐食 / アノード反応抑制作用

Outline of Final Research Achievements

Hydroxyapatite (HAP) significantly inhibited the corrosion of iron plates in sodium chloride solution and the releases of iron ions from iron plate. No formation of the layer of newly formed chemical composition on the plate surfaces was observed by analysis with TEM. The corrosion electric potentials of metals were increased. The linear sweep voltammetry (LSV) between iron and platinum electrode were significantly inhibited by HAP. It was suggest that the inhibitory effect of HAP on the anode reaction of iron corrosion reaction seems to be caused by some physical mechanisms. The fresh-concrete containing HAP fitted with JIS standard. The compressive strength of the test pieces with HAP were more than 40 N/mm2 as well as those of the test pieces without HAP. The inhibitory effects of HAP on the corrosion of iron sands in the concrete test pieces containing iron sands with HAP were confirmed in the sodium chloride solution with 1N hydrochloric acid.

Research Products

• [Patent(Industrial Property Rights)] 錆抑制用添加物、錆抑制方法及び錆抑制用塗料 (2017)
  • Inventor(s): 掛川寿夫、末永慶寛、松本洋明、高梨仁志、上原大志
  • Industrial Property Rights Holder: 掛川寿夫、末永慶寛、松本洋明、高梨仁志、上原大志
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2017-002794
  • Filing Date: 2017-01-11
• [Patent(Industrial Property Rights)] 樹脂組成物、充填剤およびコーキング層の製造方法 (2016)
  • Inventor(s): 掛川寿夫、高梨仁志、上原大志
  • Industrial Property Rights Holder: 香川大学、イーエスティージャパン、DOWAホールディングス
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2016-011286
  • Filing Date: 2016-02-26
• [Patent(Industrial Property Rights)] 金属の腐食阻害方法 (2014)
  • Inventor(s): 掛川寿夫、末永慶寬、高梨仁志
  • Industrial Property Rights Holder: 掛川寿夫、末永慶寬、高梨仁志
  • Industrial Property Rights Type: 特許
  • Industrial Property Number: 2014-205937
  • Filing Date: 2014-10-06