2007 Fiscal Year Final Research Report Summary
Development of thermal spray coatings with corrosion protecting and antifouling properties
| Project/Area Number |
17360426
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Naval and maritime engineering
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| Research Institution | National Maritime Research Institute |
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Principal Investigator |
MURAKAMI Kenji National Maritime Research Institute, Structure and Materials Department, Group Leader (60112067)
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| Co-Investigator(Kenkyū-buntansha) |
SENDA Tetsuya National Maritime Research Institute, Energy and Environment Assessment Department, Director (80344240)
UEMATSU Susumu National Maritime Research Institute, Structure and Materials Department, Senior Researcher (10344235)
TAKAHASHI Chiori National Maritime Research Institute, Energy and Environment Assessment Department, Group Leader (40399530)
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| Project Period (FY) |
2005 – 2007
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| Keywords | corrosion protection / antifouling / aluminum-copper thermal spray coating / aluminum-zinc thermal spray coating / steel substrate / biofouling / corrosion products / under-coat |
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| Research Abstract |
For the purpose of development of thermal spray coatings with both corrosion protection and antifouling properties, aluminum-copper coatings, aluminum-zinc coating and zinc coatings are sprayed onto a steel substrate and are immersed in the sea. Some of the substrates are treated with an aluminum under-coat prior to the spraying of the above-mentioned coatings(top-coats). While barnacles adhered to the aluminum-copper alloy coatings of copper content lower than 20 mass% and to the aluminum-copper blend coatings of the copper content lower than 40 mass%, rusting of the steel substrates occurred in the case of the coatings of higher copper content. The zinc coatings and aluminum-zinc coatings containing more than 50 mass% zinc possess both corrosion protection and antifouling characteristics. It was found that the application of the aluminum under-coat promotes the corrosion of the top-coats themselves. In this case, the corrosion started on or near the top-coat/under-coat boundary or the under-coat/substrate boundary. The corrosion product(s) lift the top-coats and are also accumulated on the top-coats.
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