CN212956648U - Composite cathodic protection system for cathodic protection of offshore steel structure - Google Patents
Composite cathodic protection system for cathodic protection of offshore steel structure Download PDFInfo
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- CN212956648U CN212956648U CN202020938243.0U CN202020938243U CN212956648U CN 212956648 U CN212956648 U CN 212956648U CN 202020938243 U CN202020938243 U CN 202020938243U CN 212956648 U CN212956648 U CN 212956648U
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Abstract
The utility model discloses a sacrificial anode-compound cathodic protection system of mortar for marine steel construction cathodic protection, it pours the body including surrounding the annular conductive mortar outside the steel construction, places the mortar ratio of annular conductive mortar in and pours two piece at least sacrificial anode mortar test blocks of the body unanimity with annular conductive mortar in, sacrificial anode mortar test block is inside to have buried zinc area positive pole underground, and zinc area positive pole one end welding wire draws out sacrificial anode mortar test block outside and is connected with the copper conductor electricity of drawing forth from the steel construction surface. The utility model discloses can confirm the mortar conductivity that uses in the maintenance according to the needs of the on-the-spot condition, confirm the doping amount of lithium bromide according to the application environment and prepare conductive mortar, not only guarantee that the effective protection of steel construction can also greatly reduced engineering cost.
Description
Technical Field
The utility model belongs to the corrosion protection field of ocean engineering steel structure, in particular to a preparation method and application of conductive mortar for steel structure sacrificial anode cathodic protection.
Background
The ocean engineering steel structure faces severe corrosion environments such as high humidity, high salinity, alternation of dryness and wetness and the like, the corrosion problem of the steel structure is prominent under the action of ocean atmosphere, seawater erosion and sea wave impact for a long time, and the safety service of the ocean engineering steel structure is seriously threatened (RT Vashi, HK Kadiya. Corrossion study of metals in marine environment [ J ]. Journal of Chemistry,2009, 6(4): sand-1246). In order to ensure the long-term safe operation of the steel structure equipment in the marine industry, the sacrificial anode cathodic protection technology is widely used for improving the durability of the underwater steel structure (high intelligence, strong yellow aspiration and strong WangZhi. research on novel anode for cathodic protection of the steel structure in the marine engineering [ J ]. corrosion and protection, 2015,36(11): 1086-1089). However, in the steel structure under the condition of atmosphere or splash zone, because the surface of the structure is in a dry or partially dry state, an ion loop cannot be formed between the sacrificial anode and the steel structure, and the whole protection effect is poor. In recent years, sacrificial anode-mortar composite cathodic protection technology has become a new direction for steel structure protection research by using conductive mortar which is not affected by application environment as the electrolyte for cathodic protection (sergi. G Ten-layer electrolytes of organic crystalline adhesives in steel recycled concrete [ J ]. Materials and plastics, 2011,62(2): 98-104). However, the high resistivity of the mortar is a major problem limiting the engineering application of sacrificial anode-mortar composite cathode protection technology, and the research and development of novel low resistivity mortar is the focus of current research.
SUMMERY OF THE UTILITY MODEL
The utility model aims to research and develop novel high-conductivity mortar for the sacrificial anode cathodic protection system of ocean engineering steel structure ensures the life cycle safety of marine engineering steel structure and is in service.
The utility model discloses a realize through following technical scheme: a sacrificial anode-mortar composite cathodic protection system for cathodic protection of an offshore steel structure is characterized by comprising: the device comprises an annular conductive mortar pouring body surrounding the steel structure, and at least two sacrificial anode mortar test blocks which are arranged in the annular conductive mortar pouring body and have the mortar ratio consistent with that of the annular conductive mortar pouring body, wherein zinc strip anodes are embedded in the sacrificial anode mortar test blocks, and one ends of the zinc strip anodes are welded with leads to lead out of the sacrificial anode mortar test blocks and are electrically connected with copper leads led out of the surface of the steel structure.
The sacrificial anode mortar test block is a prefabricated member.
The sacrificial anode mortar test block comprises 2 sacrificial anode mortar test blocks which are arranged in the center of a gap between the inner wall of the fixed sheath and the outer wall of the steel pipe pile in a bilateral symmetry mode.
The utility model discloses confirm the mortar conductivity that uses in the maintenance according to the needs of the site conditions, to being in the atmosphere district and splashing the district steel construction, the dry higher conductivity mortar of environment needs, and be in the environment of moisturizing to unrestrained district and underwater region steel construction, lower conductivity mortar can satisfy the application demand, confirms the doping amount of lithium bromide according to the application environment and prepares conductive mortar, not only guarantees that the effective protection of steel construction can also greatly reduced engineering cost. The prepared conductive mortar is poured outside the steel structure, and the quantity, the size and the distribution position of the sacrificial anodes are determined according to the corrosion degree and the corrosion area of the steel structure, so that the maintenance period and the safe service life of the marine steel structure can be effectively prolonged, and the method has important significance for guaranteeing the safe operation of the marine steel structure in the whole life cycle.
Drawings
FIG. 1a is a graph showing the relationship between different amounts of lithium bromide and the resistivity of a mortar test block under the condition of a curing age of 3 days;
FIG. 1b is a graph showing the relationship between different amounts of lithium bromide and the resistivity of a mortar test block in the case of a 14-day curing age;
FIG. 1c is a graph showing the relationship between different amounts of lithium bromide and the resistivity of a mortar test block at a curing age of 28 days;
FIG. 1d is a graph showing the relationship between different amounts of lithium bromide and the resistivity of a mortar test block at the curing age of 49 days;
FIG. 2 is a schematic diagram of a sacrificial anode-mortar composite cathodic protection system application;
FIG. 3 is a graph showing the correspondence between overpotentials at different curing ages at test points (i) - (c) in example 1;
fig. 4 is a graph showing the correspondence between overpotentials at different curing ages for test points (i) - (c) in example 2.
Wherein, the steel structure 100, the copper wire 101, the sheath 200, the conductive mortar casting body 300, the sacrificial anode mortar test block 400, the zinc strip anode external guide line 401
Detailed Description
The utility model discloses a sacrificial anode-compound cathodic protection system of mortar for marine atmosphere district steel construction cathodic protection, it waters the body 300 including the annular conductive mortar who surrounds outside steel construction 100, places two piece at least sacrificial anode mortar test blocks 400 in the annular conductive mortar waters the body 300 in, sacrificial anode mortar test block 400 is inside to have buried the zinc in advance and takes the positive pole underground, and zinc takes positive pole one end welding wire to draw forth sacrificial anode mortar test block outside and be connected with the copper wire 101 electricity of drawing forth from the steel construction surface. The mortar proportion of the sacrificial anode mortar test block and the annular conductive mortar pouring body is consistent, and the mortar proportion is as follows:
lithium bromide: 1,
cement: 3 to 15 parts of a first resin composition,
sand: 9 to 45 of the total amount of the organic silicon,
water: 1.8 to 9.
The proportion of the mortar is that according to the requirement of the application occasion on the resistivity of the mortar, the doping amount of the lithium bromide is selected according to the following formula:
ρ＝(10136t0.34-10127)e-0.03m (1)
wherein: ρ represents the mortar resistivity;
t represents age;
and m represents the doping amount of anhydrous lithium bromide.
The above formula (1) is obtained by the following steps:
step 1: setting a multi-group doping test scheme for lithium bromide in the mortar proportion, weighing the lithium bromide in each group and water to prepare a solution, carrying out hydration reaction by using the solution, sequentially adding cement and sand, stirring completely, then loading into a test mould, embedding four titanium mesh parallel electrodes into the test mould, compacting, maintaining and forming, and testing the resistivity of the mortar by adopting a four-electrode method, thereby finding out the interrelation among the doping amount of the lithium bromide, the conductivity and the age of the mortar and drawing a curve of the doping amount of the lithium bromide and the conductivity of the mortar;
step 2: establishing an equation by using computer software to further fit the development conditions of the resistivity of the mortar under different ages and different mixing amounts to obtain
To formula ρ ═ (10136 t)0.34-10127)e-0.03m (1)
Wherein: ρ represents the mortar resistivity;
t represents age;
and m represents the doping amount of anhydrous lithium bromide.
Example 1: a preparation method and application of conductive mortar for cathodic protection of a steel structure in an offshore atmospheric region.
Because the surface of the steel structure in the atmospheric region is dry, in order to ensure that a good ion loop is formed between the sacrificial anode and the steel structure, the proportion of mortar with higher conductivity is required to be selected (the resistivity of the mortar is less than 500 omega cm)2) The formula is as follows:
lithium bromide: 1
Cement: 3 to 4
Sand: 9 to 12
Water: 1.8 to 2.5
Firstly, dissolving lithium bromide, then sequentially adding cement and sand, stirring for 2-5 minutes, fixing a sheath outside the steel pipe pile, wherein the distance between the sheath and the steel pipe pile is 4 cm. The sacrificial anode mortar test block is self-prepared by adopting the conductive mortar with the mixing ratio, the sacrificial anode mortar test block model is of a cylindrical structure (phi 2cm multiplied by L5 cm), a zinc strip anode is pre-embedded inside, and a lead is welded at one end of the zinc strip anode and led out. And (3) symmetrically placing 2 prepared sacrificial anode mortar test blocks in the center of a gap between the inner wall of the fixed sheath and the outer wall of the steel pipe pile, pouring the conductive mortar with the same mixing ratio, and removing the fixed sheath after maintenance.
Connecting the steel pipe pile with the sacrificial anode mortar test block by adopting a universal meter and Cu/CuSO4The sacrificial anode-mortar composite cathode protection device is a reference electrode, a steel structure wire is a working electrode for testing the potential change of different parts of the steel structure before and after connecting the sacrificial anode mortar test block, and the corrosion protection of the steel structure in the offshore atmospheric region by adopting the sacrificial anode-mortar composite cathode protection technology is realized. The result is shown in figure 3, the sacrificial anode-conductive mortar composite cathode protection technology obviously improves the protection potential of the steel structure in the atmosphere area by more than 150mV, effectively reduces the corrosion risk of the steel structure, and can provide comprehensive and sufficient protection effect for the steel structure in the atmosphere area in a long-term range.
Example 2: a preparation method and application of conductive mortar for cathodic protection of a steel structure in an offshore splash zone.
The surface of the steel structure in the splash zone is in a dry-wet alternating state, so that the requirement on the conductivity of the mortar is reduced, and the mortar proportion (the specific resistance of the mortar is 500-1000 omega-cm) is adopted to ensure that a good ion loop is formed between the sacrificial anode and the steel structure2) The following were used:
lithium bromide: 1
Cement: 4 to 7.5
Sand: 12 to 22.5
Water: 2.5 to 4.5
Firstly, dissolving lithium bromide, then sequentially adding cement and sand, stirring for 5 minutes, fixing a sheath outside the steel pipe pile, wherein the distance between the sheath and the steel pipe pile is 4 cm. The sacrificial anode mortar test block is prepared from the conductive mortar with the mixing ratio, the mortar test block model is of a cylindrical structure (phi 2cm multiplied by L5 cm), a zinc belt anode is embedded inside the mortar test block model, and a lead is welded at one end of the zinc belt anode to be led out. And (3) uniformly placing 2 self-made sacrificial anode mortar test blocks in gaps between the fixed sheath and the steel pipe pile, pouring the conductive mortar with the same mixing ratio, and removing the fixed sheath after maintenance.
The steel pipe pile is subjected to intermittent salt water spraying to simulate the marine environment of a splash zone, the steel pipe pile and the sacrificial anode mortar test block are connected, the potential changes of different parts of the steel structure are tested, and corrosion protection of the steel structure of the splash zone at sea is realized by adopting a sacrificial anode-mortar composite cathode protection technology. The result is shown in fig. 4, the sacrificial anode-conductive mortar composite cathode protection technology remarkably improves the protective potential of the steel structure in the splash zone by more than 100mV, effectively reduces the corrosion risk of the steel structure, and can provide comprehensive and sufficient protection effect for the steel structure in the splash zone in a long-term range.
Claims (3)
1. A composite cathodic protection system for cathodic protection of offshore steel structures, characterized by comprising: the device comprises an annular conductive mortar pouring body surrounding the steel structure, and at least two sacrificial anode mortar test blocks which are arranged in the annular conductive mortar pouring body and have the mortar ratio consistent with that of the annular conductive mortar pouring body, wherein zinc strip anodes are embedded in the sacrificial anode mortar test blocks, and one ends of the zinc strip anodes are welded with leads to lead out of the sacrificial anode mortar test blocks and are electrically connected with copper leads led out of the surface of the steel structure.
2. The composite cathodic protection system for cathodic protection of offshore steel structures as claimed in claim 1, characterized in that: the sacrificial anode mortar test block is a prefabricated member.
3. The composite cathodic protection system for cathodic protection of offshore steel structures as set forth in claim 2, wherein: the sacrificial anode mortar test block comprises 2 sacrificial anode mortar test blocks which are arranged in the center of a gap between the inner wall of the fixed sheath and the outer wall of the steel pipe pile in a bilateral symmetry mode.
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