陰極保護用鋁合金犧牲陽極鋼樁設計參數(shù)Design parameters of aluminum alloy sacrificial anode steel piles for cathodic protection

時間：2022-09-08

陰極保護用鋁合金犧牲陽極鋼樁設計參數(shù)

（1）鋼管樁伸入承臺的上部0.8m范圍為裸管。

（2）棵管下水位變動區(qū)8.2m范圍內(nèi)(標高+1.2~ -7m)采用總厚度≥1000μm的高性能復合加強雙層熔融結合環(huán)氧粉末涂層防腐，其中底層厚度≥350μm，面層厚度≥650μm。

（3）水下區(qū)8-38m范圍內(nèi)(標高-7~ -37m)采用總厚度≥650μm的高性能復合普通雙層熔融結合環(huán)氧粉末涂層防腐，其中底層厚度≥350μm,面層厚度≥300μm。

（4）泥下區(qū)采用總厚度≥450μm的高性能普通雙層磨砂型環(huán)氧粉末涂層防腐，其中底層厚度≥350μm，面層磨砂型涂層厚度≥100μm。

（5）鋼管樁犧牲陽極陰極保護系統(tǒng)保護范圍為水位變化區(qū)水中區(qū)和泥下區(qū)。陽極材料選擇高效鋁合金陽極，**期陰極保護設計壽命為不小于30年，運營期內(nèi)可根據(jù)結構耐久性需要進行更換，每次更換有效期應不小于30年。

（6）鋼管樁保護電位為-0.85~-1.10V(相對于飽和銅/硫酸銅參比電極)。

（7）陰極保護設計的前提是鋼管外壁涂覆高性能復合環(huán)氧涂層，涂層初始破損率小于1％，30年涂層破損率小于15％，平均防腐層破損率為8％。

（8）**海水的電阻率為25~30Ω·cm

3.陽極性能

選用鋁合金陽極。

Design parameters of aluminum alloy sacrificial anode steel piles for cathodic protection
(1) The range of 0.8m where the steel pipe pile extends into the upper part of the bearing platform is the bare pipe.
(2) High performance composite reinforced double-layer fusion bonded epoxy powder coating with a total thickness of ≥ 1000 μ m is used for anticorrosion within 8.2m (elevation + 1.2 ~ - 7m) of the water level fluctuation area under the tree, of which the bottom layer thickness is ≥ 350 μ m and the surface layer thickness is ≥ 650 μ M.
(3) Within the range of 8-38m (elevation - 7-37m) in the underwater area, the total thickness ≥ 650 μ M U.M high-performance composite ordinary double-layer fusion bonded epoxy powder coating for corrosion protection, wherein the thickness of the bottom layer is ≥ 350 μ m and the thickness of the surface layer is ≥ 300 μ M.
(4) High performance ordinary double-layer frosted epoxy powder coating with a total thickness of ≥ 450 μ m is used for anti-corrosion in the mud area, wherein the bottom layer thickness is ≥ 350 μ m. The thickness of the surface frosted coating is ≥ 100 μ M.
(5) The protection scope of the sacrificial anode cathodic protection system for steel pipe piles includes the water level change area, the water area and the mud area. The anode material is high-efficiency aluminum alloy anode. The design life of the first phase of cathodic protection is not less than 30 years. During the operation period, it can be replaced according to the need of structural durability. The validity period of each replacement should not be less than 30 years.
(6) The protection potential of the steel pipe pile is -0.85 ~ -1.10v (relative to the saturated copper / copper sulfate reference electrode).
(7) The premise of cathodic protection design is that the outer wall of steel pipe is coated with high-performance composite epoxy coating. The initial damage rate of the coating is less than 1%, the 30-year coating damage rate is less than 15%, and the average anti-corrosion coating damage rate is 8%.
(8) The resistivity of natural seawater is 25 ~ 30 Ω· cm
3. Anode performance
Aluminum alloy anode is selected.

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