CN103712907B - The on-the-spot corrosion electrochemical test system in a kind of deep-sea and method of testing thereof - Google Patents
The on-the-spot corrosion electrochemical test system in a kind of deep-sea and method of testing thereof Download PDFInfo
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Abstract
The invention belongs to field of ocean engineering, the specifically on-the-spot corrosion electrochemical test system in deep-sea and a method of testing thereof, plug connector formula electrode system, porous radome that device comprises withstand voltage watertight electronic compartment, is positioned at the corrosion electrochemistry test macro of described withstand voltage watertight electronic compartment, is integrated in outside, described withstand voltage watertight electronic compartment one end; Corrosion electrochemistry test macro is connected by wire with plug connector formula electrode system, porous radome be arranged on withstand voltage watertight electronic compartment one end, plug connector formula electrode system covered on the inside.The present invention can carry out original position under deep-marine-environment, detect operation in real time, fast, has high pressure resistant, water-impervious, anticorrosion, antijamming capability are strong; Volume is little, intensity is high, insulation and the feature such as good seal performance.
Description
Technical field
The invention belongs to field of ocean engineering, specifically the on-the-spot corrosion electrochemical test system in a kind of deep-sea and method of testing thereof.
Background technology
Marine environment is a kind of corrosion environment of harshness, and the metallic structures such as port installations, oil platform, subsea pipeline, marine ship, deep sea vehicle all must think over the etching problem that marine environment brings in design and use process.In order to grasp the corrosion behavior of various material in marine environment and rule; for the exploitation of the design of fixing or mobile ocean steel construction, selection, protection and new material provides basis and foundation; the corrosion test of real extra large environment must be carried out, accumulate the corrosion data of various material in practical service environment.At present, the corrosion test in surface seawater has set up both at home and abroad test method and the technology of standard all, also there has been more deep understanding, have accumulated a large amount of valuable basic data to the corrosion behavior of metal material in surface seawater and rule.But due to the complicacy of deep-marine-environment, it is also little that the material Deep sea corrosion test within the scope of our times is carried out, and the deep-sea corrosion data of China is then blank substantially.
The developed countries such as the U.S., USSR (Union of Soviet Socialist Republics), Japan, Holland, India, just start the deep-marine-environment corrosion test of material as far back as the sixties in 20th century.Such as, within 1988 ~ 1989 years, deep-sea consulting service company of the U.S. exposes corrosion testing apparatus by ARCOOil & Gas company Commission Design deep water, and is responsible for carrying out manufacturing and throwing in; Nineteen ninety, deep-sea consulting service company of the U.S. exposes corrosion testing apparatus by Chevron company Commission Design deep water, and is responsible for carrying out manufacturing and throwing in.The object of these tests is corrosive natures of research deep-sea PetroChina Company Limited. facility, and test method is limited as the weight-loss corrosion test under the exposure condition of deep-sea more.Deep-sea exposes zero-G test complicated operation, consuming time, dangerous, costly, and equipment failure rate is high, the recovery is low, once go wrong, direct loss will reach millions of dollars, and the time of losing and workload cannot be estimated; But its subject matter is also that weight-loss method only can provide the average data of macroscopic view, and can not provide the mechanistic information of interface microcosmic effect, and be difficult to accomplish fast, original position and measuring in real time.According to India, expose through the deep-seas of 174 days, only obtain the corrosion depth data of 5 kinds of ferroalloys, 4 depth of waters and corresponding environmental factor data.
As the deep-sea simulated acceleration test of zero-G test research for matching means, deep-sea simulated acceleration test fast, easily can be carried out to various types of materials, parts and small members, the corrosion regularity of research material under simulated conditions and mechanism, supplement mutually with Natural Environmental Test.Such as, the deep water corrosion testing apparatus that Cormet company of Finland manufactures, utilizes the physical-chemical parameters of flow circuit Systematical control seawater, carries out the corrosion test of material under pressure and various condition of water quality, and tests and demarcate various sensor.But even like this, deep-sea simulated acceleration test remains very difficult, dangerous and expensive.And in the material corrosion experimental study of surface seawater, obtain the electrochemical test method of very ten-strike; it not only can provide the information of abundant interface microcosmic effect; and it fast, original position, the advantage measured in real time be also that deep-sea exposes the method such as zero-G test and deep-sea simulated acceleration test and is difficult to accomplish, thus it should become the Main Means of research material deep-sea corrosion behavior, mechanism and guard method thereof.But, current electrochemical test method can only be applied mostly under indoor normal pressure and the condition simulating deep-sea water quality, electro-chemical test under high hydrostatic pressure condition remains at certain difficulty, and in maintenance electrolytic cell, is also difficult to Measurement accuracy while high hydrostatic pressure and controls various to the influential seawater quality condition of corrosion process.Because deep-marine-environment has the environmental corrosion characteristic of its uniqueness, even if can simulate actual environment completely in indoor, the data result obtained in laboratory still needs to verify under real extra large environment.
Summary of the invention
In order to solve above-mentioned Problems existing, the object of the present invention is to provide the on-the-spot corrosion electrochemical test system in a kind of deep-sea and method of testing thereof.This proving installation can carry out original position, detect operation in real time, fast within 100 ~ 1000 meters of depth of water under sea, to obtain the polarization curve of main oceanographic engineering material in deep-marine-environment, electrochemical impedance spectroscopy and corresponding reactive kinetics parameters.
The object of the invention is to be achieved through the following technical solutions:
Proving installation comprises withstand voltage watertight electronic compartment, is positioned at the corrosion electrochemistry test macro of described withstand voltage watertight electronic compartment, is integrated in the plug connector formula electrode system of outside, described withstand voltage watertight electronic compartment one end, porous radome; Corrosion electrochemistry test macro is connected by wire with described plug connector formula electrode system, described porous radome be arranged on withstand voltage watertight electronic compartment one end, plug connector formula electrode system covered on the inside.
Wherein: described withstand voltage watertight electronic compartment comprises cylindrical shell, reinforced blind flange and umbilical cable interface, cylindrical shell is hollow structure inside, the shell flange at cylindrical shell two ends is sealedly connected with reinforced blind flange respectively, be provided with guide rail in inner barrel, described corrosion electrochemistry test macro is installed on the guideway; Described plug connector formula electrode system and porous radome are arranged on the reinforced blind flange of one end respectively, and described umbilical cable interface is arranged on the reinforced blind flange of the other end; Described corrosion electrochemistry test macro comprises backup direct supply, industrial computer and potentiostat, and this direct supply, industrial computer and potentiostat are arranged on described guide rail respectively, are connected each other by wire; Be connected respectively by wire between described direct supply with umbilical cable interface, between industrial computer with umbilical cable interface and between potentiostat with socket connector type electrode system; The axial cross section of described cylindrical shell is " work " font, and through hole is offered vertically in inside, and described guide rail is arranged on the inside of cylindrical shell vertically; The two ends of described cylindrical shell are shell flange, and the part between two shell flanges is right cylinder; The end face of the shell flange at described cylindrical shell two ends and endoporus are tightly connected respectively by O RunddichtringO and reinforced blind flange; The reinforced blind flange of the described other end is provided with suspension ring; Described plug connector formula electrode system comprises changeable type working electrode, two auxiliary electrode and two contrast electrode, wherein changeable type working electrode is positioned at the center of the reinforced blind flange in described one end, and described pair of auxiliary electrode and two contrast electrode are that circumference is uniform in the surrounding of this changeable type working electrode; Described porous radome is arranged on the reinforced blind flange in described one end, and the cover wall of this porous radome is circumferentially evenly equipped with multiple hole;
Method of testing, comprises the following steps:
Withstand voltage watertight electronic compartment and multi-parameter water quality being popped one's head in is respectively installed on underwater robot, and umbilical cable two ends are connected with the mains power interface of the umbilical cable interface on the reinforced blind flange in withstand voltage watertight electronic compartment one end and underwater robot, communication interface watertight respectively;
In advance operating depth setting is carried out to underwater robot, prefabricated replaceable electrode is arranged on working electrode socket, setting multi-parameter water quality probe cut-in time;
Water under underwater robot, horizontal maneuver is made after arriving the depth of water preset, the flow velocity of displacement speed and seawater is measured by the ADCP device of self, and real-time storage data, underwater robot carries out electro-chemical test by umbilical cable triggering corrosion electrochemistry test macro simultaneously; The water quality parameter affecting the on-the-spot seawater of material corrosion process carries out the acquisition of self-tolerant real-time testing by multi-parameter water quality probe;
After electro-chemical test completes, send instruction by industrial computer to underwater robot, underwater robot returns;
Wherein: the job order that described corrosion electrochemistry test macro carries out electro-chemical test is:
1) in withstand voltage watertight electronic compartment, industrial computer checks the connectedness of contrast electrode, if connective good, carry out pre-polarizing to working electrode, otherwise test terminates;
2) open circuit potential of monitoring electrode, until open circuit potential is stablized;
3) utilize the open circuit potential recorded, carry out ac impedance measurement: the sweep limit of setting AC sine wave pumping signal is 100000 ~ 0.01Hz, amplitude 5 ~ 10mV, every frequency multiplication test 5 ~ 10 points, preserve test data;
4) again open circuit potential is monitored, until open circuit potential is stablized;
5) carry out polarization curve test: set electric potential scanning scope as relative to open circuit potential ± (50 ~ 250) mV, potential scan rate is 0.1 ~ 1mV/s, preserve test data;
6) test terminates, and industrial computer sends return signal by umbilical cable to underwater robot.
Advantage of the present invention and good effect are:
The present invention can carry out original position under deep-marine-environment, detect operation in real time, fast, has high pressure resistant, water-impervious, anticorrosion, antijamming capability are strong; Volume is little, intensity is high, insulation and the feature such as good seal performance.
Accompanying drawing explanation
Fig. 1 is the structural representation of proving installation of the present invention;
Fig. 2 is the A-A cut-open view in Fig. 1;
Fig. 3 is the control flow chart of method of testing of the present invention;
Wherein: 11 is cylindrical shell, 12 is guide rail, and 13 is an O RunddichtringO, 14 is reinforced blind flange, and 15 is umbilical cable interface, and 16 is suspension ring, 17 is the 2nd O RunddichtringO, and 21 is direct supply, and 22 is industrial computer, 23 is potentiostat, 31 is changeable type working electrode, and 32 is two auxiliary electrodes, and 33 is two contrast electrodes, 41 is porous radome, and 42 is hole.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
As shown in Figure 1 and Figure 2, proving installation of the present invention comprises withstand voltage watertight electronic compartment, corrosion electrochemistry test macro, plug connector formula electrode system and porous radome 41, wherein corrosion electrochemistry test macro is positioned at withstand voltage watertight electronic compartment, plug connector formula electrode system is integrated in the outside of withstand voltage watertight electronic compartment one end, corrosion electrochemistry test macro is connected by wire with plug connector formula electrode system, described porous radome 41 be arranged on withstand voltage watertight electronic compartment one end, plug connector formula electrode system covered on the inside.
Withstand voltage watertight electronic compartment comprises cylindrical shell 11, umbilical cable interface 15 and reinforced blind flange 14, and its middle cylinder body 11 is hollow structure inside, and the axial cross section of cylindrical shell 11 is " work " font, and through hole is offered vertically in inside; The two ends of cylindrical shell 11 are shell flange, and the part between two shell flanges is right cylinder.The shell flange at cylindrical shell 11 two ends is sealedly connected with reinforced blind flange 14 respectively, the double-layer seal of axial and circumferential is realized between cylindrical shell 11 two ends and reinforced blind flange 14, the groove of standard is offered respectively on the end face of the i.e. shell flange at cylindrical shell 11 two ends and on reinforced blind flange 14, an O RunddichtringO 13 is put in groove on shell flange end face, the 2nd O RunddichtringO 17 is put in groove on reinforced blind flange 14, then use 4 ~ 6 bolts by fastening to cylindrical shell 11 and reinforced blind flange 14, the end face of the shell flange at cylindrical shell 11 two ends and endoporus can be realized by first, two O RunddichtringOs 13, 17 with the axial and circumferential double-layer seal of reinforced blind flange 14.Cylindrical shell 11 and reinforced blind flange 14 can adopt 16MnR material through the explained hereafter such as turning, soldering, its middle cylinder body 11 can be welded by steel tube profile and standard long-neck W.N flange, the epoxy zinc rich primer that external coating epoxy zinc-enriched paint (can adopt AkzoNobel(Akzo Nobel) company produces), guarantee machining precision and welding, coating quality.
The reinforced blind flange 14 at cylindrical shell 11 two ends all has threaded hole, size according to assembling need determine, wherein for installing the underwater electrical connector of plug connector formula electrode system, the threaded hole of umbilical cable interface 15 is through hole.In order to keep good sealing, O type circle is used to make gasket seal.
Be provided with guide rail 12 in cylindrical shell 11 inside, corrosion electrochemistry test macro is arranged on this guide rail 12; Plug connector formula electrode system and porous radome 41 are assemblied on the reinforced blind flange 14 of one end respectively, and umbilical cable interface 15, suspension ring 16 are arranged on the reinforced blind flange 14 of the other end.Corrosion electrochemistry test macro comprises three kinds of virtual instrument softwares such as direct supply 21, industrial computer 22, the potentiostat 23 controlled by industrial computer 22 and open circuit potential monitor, dynamic potential scanning instrument and frequency response analyzer, this direct supply 21, industrial computer 22 and potentiostat 23 are arranged on the guide rail 12 in cylindrical shell 11 respectively, are connected each other by wire; Between direct supply 21 and umbilical cable interface 15, between industrial computer 22 and umbilical cable interface 15, be connected respectively by wire between potentiostat 23 with socket connector type electrode system, to realize the transmission of electric power and signal data.Three kinds of virtual instrument softwares such as open circuit potential monitor, dynamic potential scanning instrument and frequency response analyzer based on LabVIEW instrument development platform development, can be debugged successfully and can import industrial computer, and carry out corresponding test.Before lower water test, the connectivity reply each several part of tackling each parts checks fully, debugging.
Proving installation of the present invention is powered by the umbilical cable of ROV, when ROV powers appearance interruption, will enable backup direct supply to meet the needs of instrument test; Three kinds of virtual instruments such as open circuit potential monitor, dynamic potential scanning instrument and frequency response analyzer are based on virtual instrument development platform and data acquisition hardware component, are integrated in portable potentiostat, accept the control of industrial computer; The built-in command of industrial computer can preset, and can also accept outside real-time control through umbilical cable.
Plug connector formula electrode system comprises changeable type working electrode 31, two auxiliary electrode 32 and two contrast electrode 33, wherein changeable type working electrode 31 is positioned at the center of the reinforced blind flange 14 in described one end, and two auxiliary electrode 32 and two contrast electrode 33 are that circumference is uniform in the surrounding of this changeable type working electrode 31.Plug connector formula electrode system is connected on the corrosion electrochemistry test macro of body inside, cabin by the reinforced blind flange of watertight socket in withstand voltage watertight electronic compartment, carries out Corrosion monitoring operation.Porous radome is installed to form open protected type electrolytic cell in electrode system outside, both can limits the current leakage of electrode system, fully contacting of electrode system and seawater can be ensured again, realize opening and the shielding of electrolytic cell.Plug connector formula electrode system directly contacts with deep-marine-environment; on-line testing is carried out by the corrosion electrochemistry test macro of withstand voltage watertight electronic compartment inside; the reaction kinetics information that original position obtains and specifies waters, specify the main oceanographic engineering material in depth of water place; and interrelated with pop one's head in on-the-spot seawater quality parameter parameters such as () temperature, salinity, dissolved oxygen DO, pH, oxidation-reduction potential of the material corrosion process that affects recorded of underwater robot (ROV) upper integrated multi-parameter water quality, the corrosion behavior of grasp material and mechanism.
Porous radome 41 is arranged on the reinforced blind flange 14 of one end, the cover wall of this porous radome 41 is circumferentially evenly equipped with multiple hole 42, to realize opening; Porous radome 41 is made by Teflon or duplex stainless steel 2205 application bituminous epoxy paint.
Proving installation of the present invention is arranged on ROV together with popping one's head in multi-parameter water quality, accept work boat by umbilical cable power and receive work order, can test the marine corrosion characteristic of different waters, during work, watertight electronic compartment does not need dismounting, only experimentally need require to change working electrode, then be put into the different depth water layer in target marine site with ROV cloth.
Method of testing of the present invention is:
Withstand voltage watertight electronic compartment and multi-parameter water quality being popped one's head in is respectively installed on underwater robot; Umbilical cable two ends are connected with the mains power interface of the umbilical cable interface 15 on the reinforced blind flange 14 in withstand voltage watertight electronic compartment one end and underwater robot, communication interface watertight respectively; In advance operating depth setting is carried out to underwater robot, prefabricated replaceable electrode is arranged on working electrode socket, setting multi-parameter water quality probe cut-in time; Water under underwater robot, horizontal maneuver is made after arriving the depth of water preset, ADCP(ADCP advanced data communication protocol by self) device measures the flow velocity of displacement speed and seawater, and real-time storage data, simultaneously underwater robot triggers corrosion electrochemistry test macro by umbilical cable and carries out electro-chemical test, is affected on-the-spot seawater quality parameter parameters such as () temperature, salinity, dissolved oxygen DO, pH, oxidation-reduction potential of material corrosion process by multi-parameter water quality probe real-time testing; The measuring process of the water quality parameter of on-the-spot seawater is prior art.After electro-chemical test completes, send instruction by industrial computer 22 to underwater robot, underwater robot returns.Underwater robot is reclaimed, import on a computer respectively by the umbilical cable interface of the communication interface of underwater robot, withstand voltage watertight electronic compartment, the umbilical cable interface of multi-parameter water quality probe by test data, control experiment data analysis working electrode is specifying the corrosion mechanism at depth of water place; Working electrode is provided for simple replacement of, new round test can be carried out to underwater robot, withstand voltage watertight electronic compartment, multi-parameter water quality probe after setting.
After receiving the triggering corrosion electrochemistry test signal of underwater robot, the job order of electrochemical test system is: 1) in withstand voltage watertight electronic compartment, first industrial computer 22 will check the connectedness of contrast electrode, well pre-polarizing is carried out to working electrode if connective, otherwise test terminates; 2) open circuit potential of monitoring electrode, until open circuit potential is stablized; 3) utilize the open circuit potential recorded, carry out ac impedance measurement: the sweep limit of setting AC sine wave pumping signal is 100000 ~ 0.01Hz, amplitude 5 ~ 10mV, every frequency multiplication test 5 ~ 10 points, preserve test data; 4) step monitors open circuit potential again, until open circuit potential is stablized; 5) polarization curve test is carried out: set electric potential scanning scope as relative to open circuit potential ± (50 ~ 250) mV, potential scan rate is 0.1 ~ 1mV/s, preservation test data; 6), after test terminates, industrial computer sends return signal by umbilical cable to underwater robot.
Claims (8)
1. the on-the-spot corrosion electrochemical test system in deep-sea, is characterized in that: comprise
Withstand voltage watertight electronic compartment,
Be positioned at the corrosion electrochemistry test macro of described withstand voltage watertight electronic compartment,
Be integrated in the plug connector formula electrode system of outside, described withstand voltage watertight electronic compartment one end,
Porous radome (41);
Wherein corrosion electrochemistry test macro is connected by wire with described plug connector formula electrode system, described porous radome (41) be arranged on withstand voltage watertight electronic compartment one end, plug connector formula electrode system covered on the inside;
Described withstand voltage watertight electronic compartment comprises cylindrical shell (11), reinforced blind flange (14) and umbilical cable interface (15), its middle cylinder body (11) is hollow structure inside, the shell flange at cylindrical shell two ends is sealedly connected with reinforced blind flange (14) respectively, be provided with guide rail (12) in cylindrical shell (11) inside, described corrosion electrochemistry test macro is arranged on this guide rail (12); Described plug connector formula electrode system and porous radome (41) are arranged on the reinforced blind flange (14) of one end respectively, and described umbilical cable interface (15) is arranged on the reinforced blind flange (14) of the other end;
Described porous radome (41) is arranged on the reinforced blind flange in described one end (14), the cover wall of this porous radome (41) is circumferentially evenly equipped with multiple hole (42).
2. by the on-the-spot corrosion electrochemical test system in deep-sea according to claim 1, it is characterized in that: described corrosion electrochemistry test macro comprises backup direct supply (21), industrial computer (22) and potentiostat (23), this direct supply (21), industrial computer (22) and potentiostat (23) are arranged on described guide rail (12) respectively, are connected each other by wire; Between described direct supply (21) with umbilical cable interface (15), between industrial computer (22) with umbilical cable interface (15) and potentiostat (23) be connected respectively by wire with between socket connector type electrode system.
3. by the on-the-spot corrosion electrochemical test system in deep-sea according to claim 1, it is characterized in that: the axial cross section of described cylindrical shell (11) is " work " font, through hole is offered vertically in inside, and described guide rail (12) is arranged on the inside of cylindrical shell (11) vertically; The two ends of described cylindrical shell (11) are shell flange, and the part between two shell flanges is right cylinder.
4., by the on-the-spot corrosion electrochemical test system in deep-sea according to claim 1, it is characterized in that: the end face of the shell flange at described cylindrical shell (11) two ends and endoporus are tightly connected respectively by O RunddichtringO and reinforced blind flange (14).
5., by the on-the-spot corrosion electrochemical test system in deep-sea according to claim 1, it is characterized in that: the reinforced blind flange (14) of the described other end is provided with suspension ring (16).
6. by the on-the-spot corrosion electrochemical test system in deep-sea according to claim 1, it is characterized in that: described plug connector formula electrode system comprises changeable type working electrode (31), two auxiliary electrode (32) and two contrast electrode (33), wherein changeable type working electrode (31) is positioned at the center of the reinforced blind flange in described one end (14), and described pair of auxiliary electrode (32) and two contrast electrode (33) are that circumference is uniform in the surrounding of this changeable type working electrode (31).
7. a method of testing for the on-the-spot corrosion electrochemical test system in the deep-sea described in the arbitrary claim of claim 1 to 6, is characterized in that: comprise the following steps:
Withstand voltage watertight electronic compartment and multi-parameter water quality being popped one's head in is respectively installed on underwater robot, and umbilical cable two ends are connected with the mains power interface of the umbilical cable interface (15) on the reinforced blind flange in withstand voltage watertight electronic compartment one end (14) and underwater robot, communication interface watertight respectively;
In advance operating depth setting is carried out to underwater robot, prefabricated replaceable electrode is arranged on working electrode socket, setting multi-parameter water quality probe cut-in time;
Water under underwater robot, horizontal maneuver is made after arriving the depth of water preset, the flow velocity of displacement speed and seawater is measured by the ADCP device of self, and real-time storage data, underwater robot carries out electro-chemical test by umbilical cable triggering corrosion electrochemistry test macro simultaneously; The water quality parameter affecting the on-the-spot seawater of material corrosion process carries out the acquisition of self-tolerant real-time testing by multi-parameter water quality probe;
After electro-chemical test completes, send instruction by industrial computer (22) to underwater robot, underwater robot returns.
8., by method of testing according to claim 7, it is characterized in that: the job order that described corrosion electrochemistry test macro carries out electro-chemical test is:
1) in withstand voltage watertight electronic compartment, industrial computer (22) checks the connectedness of contrast electrode, if connective good, carry out pre-polarizing to working electrode, otherwise test terminates;
2) open circuit potential of monitoring electrode, until open circuit potential is stablized;
3) utilize the open circuit potential recorded, carry out ac impedance measurement: the sweep limit of setting AC sine wave pumping signal is 100000 ~ 0.01Hz, amplitude 5 ~ 10mV, every frequency multiplication test 5 ~ 10 points, preserve test data;
4) again open circuit potential is monitored, until open circuit potential is stablized;
5) carry out polarization curve test: set electric potential scanning scope as relative to open circuit potential ± (50 ~ 250) mV, potential scan rate is 0.1 ~ 1mV/s, preserve test data;
6) test terminates, and industrial computer sends return signal by umbilical cable to underwater robot.
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| 海底管线腐蚀检测与腐蚀预测的研究;胡舸;《中国博士学位论文全文数据库 工程科技I辑》;20071115;第63页第1段，第89页末段，第90页全文，图3.33，第91页末段，第92页全文，图3.35，第94页末段，第95页第2段图3.37,3.38,3.39，第96页第1段，图3.40，第99页3.3.5系统集成，第1段 * |
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