JP4789627B2 - 鋼構造物の電気防食方法 - Google Patents
鋼構造物の電気防食方法 Download PDFInfo
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- JP4789627B2 JP4789627B2 JP2006004359A JP2006004359A JP4789627B2 JP 4789627 B2 JP4789627 B2 JP 4789627B2 JP 2006004359 A JP2006004359 A JP 2006004359A JP 2006004359 A JP2006004359 A JP 2006004359A JP 4789627 B2 JP4789627 B2 JP 4789627B2
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- Prior art keywords
- electrocoating
- current density
- potential
- steel
- anticorrosion
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- 229910000831 Steel Inorganic materials 0.000 title claims description 93
- 239000010959 steel Substances 0.000 title claims description 93
- 238000000034 method Methods 0.000 title claims description 41
- 239000013505 freshwater Substances 0.000 claims description 51
- 238000005260 corrosion Methods 0.000 claims description 28
- 230000007797 corrosion Effects 0.000 claims description 22
- 230000000670 limiting effect Effects 0.000 claims description 22
- 239000000463 material Substances 0.000 claims description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 16
- 239000001301 oxygen Substances 0.000 claims description 16
- 229910052760 oxygen Inorganic materials 0.000 claims description 16
- 238000004210 cathodic protection Methods 0.000 claims description 14
- 238000009792 diffusion process Methods 0.000 claims description 14
- 230000002829 reductive effect Effects 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000004070 electrodeposition Methods 0.000 description 115
- 230000015572 biosynthetic process Effects 0.000 description 37
- 230000010287 polarization Effects 0.000 description 34
- 238000002474 experimental method Methods 0.000 description 24
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 24
- 239000008399 tap water Substances 0.000 description 21
- 235000020679 tap water Nutrition 0.000 description 21
- 238000012360 testing method Methods 0.000 description 20
- 238000010586 diagram Methods 0.000 description 15
- 239000011777 magnesium Substances 0.000 description 10
- 238000005259 measurement Methods 0.000 description 10
- 239000012085 test solution Substances 0.000 description 10
- 239000011575 calcium Substances 0.000 description 9
- 239000013535 sea water Substances 0.000 description 9
- 230000001276 controlling effect Effects 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 239000002184 metal Substances 0.000 description 8
- 238000011160 research Methods 0.000 description 7
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- 238000006243 chemical reaction Methods 0.000 description 5
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- 150000002739 metals Chemical class 0.000 description 3
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- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- GTKRFUAGOKINCA-UHFFFAOYSA-M chlorosilver;silver Chemical compound [Ag].[Ag]Cl GTKRFUAGOKINCA-UHFFFAOYSA-M 0.000 description 2
- 238000005868 electrolysis reaction Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 229910000975 Carbon steel Inorganic materials 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 238000011481 absorbance measurement Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 159000000007 calcium salts Chemical class 0.000 description 1
- 239000010962 carbon steel Substances 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
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- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 159000000003 magnesium salts Chemical class 0.000 description 1
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Images
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- Prevention Of Electric Corrosion (AREA)
- Preventing Corrosion Or Incrustation Of Metals (AREA)
Description
(1)防食電流密度を溶存酸素の拡散限界電流密度以上に設定する(防食電流の設定条件)。
(2)鋼材の示す電位が-0.7V(SHE)以下になるように防食電流を設定する(防食電流の設定条件)。
(3)電位が-0.7V以下に低下し、その状態が継続すればエレクトロコーティングが形成していると判断する(エレクトロコーティング形成の判断基準)。
ilim =k・u1/3
(1)電位-0.7V付近で現れる限界電流密度よりも大きいカソード電流密度では、分極を始めてから1日以内にエレクトロコーティングの形成開始が目視で確認された。
(2)カソード電流密度を限界電流密度より小さくすると、エレクトロコーティングの形成開始時間が不定となる遷移域が現れた。更に小さいカソード電流密度では、60日経過してもエレクトロコーティングが生成しない領域が存在した。
(3)カソード電流密度が限界電流密度より小さく、分極開始直後の電位が-0.7Vより高い場合であっても、一定期間経過後、電位が約-0.7V以下に低下したときには、試験片表面にエレクトロコーティングの形成開始が認められた。
(4)エレクトロコーティングは、カソード電流密度を裸鋼の場合に比べて10分の1程度に抑制したことから、本実験で得られたエレクトロコーティングは、十分なカソード反応抑制効果を発揮した。
32 線型補助電極
33 スイッチ
34 通電線
35 直流電源装置
36 制御装置
37、38 通電線
39 鋼材表面
40 電圧測定装置
41 参照電極
42、43、44 制御信号線
50 エレクトロコーティング
Claims (6)
- 流動する淡水と接触する鋼構造物の電気防食方法において、防食電流密度を溶存酸素の拡散限界電流密度以上に設定することを特徴とする鋼構造物の電気防食方法。
- 流動する淡水と接触する鋼構造物の電気防食方法において、淡水と接触する鋼材表面部分の電位が初期的に-0.7V(SHE)以下に低下するように防食電流を制御することを特徴とする鋼構造物の電気防食方法。
- 流動する淡水と接触する鋼構造物の電気防食方法において、防食電流密度を溶存酸素の拡散限界電流密度未満に設定して防食電流を定電流制御し、エレクトロコーティングの部分的な形成によって、淡水と接触する鋼材表面部分の電位が-0.7V(SHE)以下に低下するようにしたことを特徴とする鋼構造物の電気防食方法。
- 溶存酸素の拡散限界電流密度と淡水の流速との関係が予め求められ、前記防食電流密度は、淡水の流速に基づいて設定されることを特徴とする請求項1又は3に記載の電気防食方法。
- 前記防食電流を定電流制御することを特徴とする請求項1又は2に記載の電気防食方法。
- 淡水と接触する鋼材表面部分の電位が-1.0V(SHE)以上に規制されるように防食電流を制御することを特徴とする請求項1乃至5のいずれか1項に記載の電気防食方法。
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JP2006004359A JP4789627B2 (ja) | 2005-01-13 | 2006-01-12 | 鋼構造物の電気防食方法 |
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JP2006004359A JP4789627B2 (ja) | 2005-01-13 | 2006-01-12 | 鋼構造物の電気防食方法 |
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JP2006219758A JP2006219758A (ja) | 2006-08-24 |
JP4789627B2 true JP4789627B2 (ja) | 2011-10-12 |
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Families Citing this family (1)
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CN108315740A (zh) * | 2017-01-18 | 2018-07-24 | 木浦海洋大学校产学协力团 | 基于恒定电流电解法的船舶用铝合金的空穴防损方法 |
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