Marine propeller blade anticorrosion treatment method
By vulcanizing protective rubber on marine propeller blades and wrapping nickel leading edge shields, the protection layer fatigue and corrosion problems caused by impact during high-speed rotation are solved, and stronger impact, wear and aging resistance are achieved.
Patent Information
- Application Number
- CN202311597421.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-28
- Publication Date
- 2025-06-06
AI Technical Summary
During the high-speed rotation of marine propellers, the blades of marine propellers are hit by high-speed hard objects such as gravel and shells, causing fatigue and failure of the protective layer, peeling off the paint layer and wear of the micro-arc oxide layer, which in turn causes corrosion of the leaf body.
Protective rubber material is used to directly vulcanize it on the surface of the blade body, and wrap the nickel leading edge shield at the leading edge of the paddle tip to form an integrated protective structure, replacing the traditional paint layer and micro-arc oxide layer.
It improves the impact resistance of the propeller blades, enhances durability, wear resistance and aging resistance, and effectively solves the problem of leaf body corrosion caused by the peeling of the blade paint layer and the wear of the micro-arc oxide layer.
Smart Images
Figure CN120096018A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of anti-corrosion research of marine propellers, and more specifically to an anti-corrosion treatment method for marine propeller blades. Background Art
[0002] The propeller blades for marine air propellers are made of aluminum alloy. The current surface protection structure of propeller blades is a "blade body micro-arc oxidation + leading edge vulcanized rubber + electroformed nickel edging" structure. The blade body surface is first micro-arc oxidized, and then the surface is sprayed with primer and aliphatic rain erosion resistant paint. A 2mm thick rubber is pasted on the leading edge of the blade, and then a 0.6mm thick electroformed nickel leading edge shield is bonded to the rubber surface. The nickel leading edge shield wraps the tip of the blade along the tip surface direction.
[0003] However, during the operation of the propeller, the blades rotate at high speed, especially during the retreat process, which will roll up a large amount of hard objects such as gravel and shells on the beach, and impact the blades at a linear speed of up to 237.5m / s. Under the high-speed impact of foreign objects such as gravel and shells, due to the insufficient buffering capacity and damping vibration reduction of the blade surface, the impact force will be quickly transmitted to the propeller body, causing fatigue failure of the protective layer, and then causing the blade protective layer (blade paint layer and micro-arc oxidation layer) to fall off. Such high-speed and repeated twisting and deformation force further increases the dynamic fatigue bonding strength attenuation of the nickel leading edge shield bonding layer, eventually causing partial bonding failure, local cracking of the nickel leading edge shield, and partial exposure of the aluminum alloy blade substrate to the harsh sea conditions of high humidity, heat and high salt fog. The corrosion source quickly expands, resulting in the following: Figure 4 The blade shown has extensive corrosion.
[0004] Therefore, it is necessary to provide a new anti-corrosion treatment method for marine propeller blades to solve the problem of blade corrosion caused by the peeling of the blade paint layer and the wear of the micro-arc oxidation layer. Summary of the invention
[0005] In view of this, the present invention proposes a method for anti-corrosion treatment of marine propeller blades, which can solve the problem of blade corrosion caused by the peeling of the blade paint layer and the wear of the micro-arc oxidation layer, and improve the impact resistance of the propeller blades. The specific technical scheme is as follows:
[0006] A method for anti-corrosion treatment of marine propeller blades comprises the following steps:
[0007] S1. Process the metal blade body and reserve space for the required protective rubber on the outer surface of the blade body from the blade root end face to the blade tip of the metal blade body; or, thin the outer surface of the blade body from the blade root end face to the blade tip of the original metal blade as a whole until space for the required protective rubber is thinned;
[0008] S2. Vulcanize protective rubber on the outer surface of the blade from the root end face to the blade tip of the processed metal blade body or the outer surface of the original metal blade thinning to ensure the original aerodynamic shape of the blade;
[0009] S3. Wrap the leading edge of the propeller tip with a nickel leading edge shield.
[0010] Preferably, during the processing, protective rubber is directly injected into the processing mold of the blade, and a nickel leading edge shield is wrapped around the wear-prone part of the leading edge of the blade tip. The protective rubber is vulcanized and formed integrally with the blade, and the nickel leading edge shield is directly bonded and wrapped around the leading edge of the blade tip with the help of the vulcanized rubber.
[0011] Preferably, the thickness of the protective rubber to be vulcanized on the outer surface of the blade body is: the rubber thickness at the leading edge of the blade body is 2.4-3.6 mm, and the rubber thickness at other parts is 0.7-1.1 mm.
[0012] Preferably, the standard number of the protective rubber is GJB5258-2003.
[0013] Preferably, the length of the nickel leading edge shield is 700-1000 mm.
[0014] Preferably, the thickness of the nickel leading edge shield is 0.4-0.8 mm.
[0015] Preferably, the nickel leading edge shield is bonded and formed in sections at the leading edge of the blade tip to fit the aerodynamic shape of the blade.
[0016] The present invention provides a method for treating marine propeller blades with corrosion protection, which, under the premise of keeping the metal body material of the blade unchanged, eliminates the paint layer on the surface of the blade, that is, the blade body surface is no longer subjected to micro-arc oxidation layer and spray paint layer, but a protective rubber material is directly vulcanized on the surface of the blade body, and the original aerodynamic shape of the blade is ensured, and the original leading edge rubber edging of the blade is replaced by vulcanized protective rubber, and at the same time, a nickel leading edge shield is wrapped around the leading edge of the blade tip, and the specific processing process is: the nickel leading edge shield and the blade are vulcanized together with the protective rubber in the processing mold. By adopting the method for treating blades with corrosion protection, the finally processed blades have strong durability, impact resistance, wear resistance and anti-aging performance, and have the characteristics of stable performance and excellent comprehensive performance as a whole, and finally effectively solve the problem of blade body corrosion caused by the peeling of the blade paint layer and the wear of the micro-arc oxidation layer. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0018] Figure 1 The figure is a schematic diagram of the structure of a blade processed by the method of the present invention.
[0019] Figure 2 A schematic diagram of a cross section of a blade.
[0020] Figure 3 Schematic diagram of the structure of the nickel leading edge shield on the blade.
[0021] Figure 4 This is the corrosion picture of the original metal blade body.
[0022] Figure 5 This is the actual effect of the blade after vulcanizing the protective rubber.
[0023] In the figure: 1- directly processed metal blade body or original metal blade after thinning, 2- protective rubber, 3- nickel leading edge shield, 4- blade root end face. DETAILED DESCRIPTION
[0024] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.
[0025] In the description of the present invention, it is necessary to understand that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0026] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.
[0027] Example:
[0028] This embodiment provides a method for anti-corrosion treatment of marine propeller blades, comprising the following steps:
[0029] S1, processing the metal blade body, and reserving a space for the required protective rubber 2 on the outer surface of the blade body from the blade root end face 4 to the blade tip of the metal blade body; or, thinning the outer surface of the blade body from the blade root end face 4 to the blade tip of the original metal blade as a whole, until the space for the required protective rubber 2 is thinned;
[0030] S2, vulcanizing protective rubber 2 on the outer surface of the blade body from the root end face 4 to the blade tip of the processed metal blade body or the outer surface of the original metal blade thinning part to ensure the original aerodynamic shape of the blade;
[0031] S3. Wrap the leading edge of the blade tip with a nickel leading edge shield 3.
[0032] In the present invention, the accompanying drawings Figure 1 is a schematic diagram of the structure of the blade processed by the above method. Figure 2 is a schematic diagram of the cross section of the blade. Figure 5 The actual effect diagram of the blade after vulcanization of the protective rubber 2. The blade is composed of a directly processed metal blade body or a thinned original metal blade 1, a protective rubber 2 and a nickel leading edge shield 3.
[0033] During the processing of the present invention, the protective rubber 2 can be directly injected into the processing mold of the blade (the blade is a directly processed metal blade body or an original metal blade after thinning), and the nickel leading edge shield 3 can be wrapped around the wear-prone part of the leading edge of the blade tip. The protective rubber 2 is vulcanized and integrated with the blade, and the nickel leading edge shield 3 is directly bonded and wrapped around the leading edge of the blade tip with the help of the vulcanized rubber.
[0034] That is to say, the nickel leading edge shield 3 and the blade are vulcanized together with the protective rubber 2 in the processing mold, which is simple and quick.
[0035] In a specific embodiment of the present invention, the thickness of the protective rubber 2 to be vulcanized on the outer surface of the blade is: the rubber thickness at the leading edge of the blade is 2.4-3.6 mm, preferably 3 mm, and the rubber thickness at other parts is 0.7-1.1 mm, preferably 1 mm.
[0036] The standard number of the protective rubber 2 used in the present invention is GJB5258-2003, which is a rubber material with excellent comprehensive properties such as impact resistance, wear resistance, and anti-aging performance, and can be directly vulcanized on the blade. In a specific embodiment, the rubber with a grade of 5860 is generally selected.
[0037] In a specific embodiment of the present invention, the length of the nickel leading edge shield 3 is 700-1000 mm, and the optimal length is 777 mm; the thickness of the nickel leading edge shield 3 is 0.4-0.8 mm, and the optimal length is 0.6 mm.
[0038] In a further specific embodiment, since the nickel leading edge shield 3 needs to fit the aerodynamic shape of the blade, in order to ensure the bonding quality, the nickel leading edge shield 3 is bonded and formed in sections at the leading edge of the blade tip.
[0039] Generally, in order to meet the process requirements during molding, the nickel leading edge shield 3 is divided into two sections, and the nickel leading edge shield 3 and the blade are vulcanized together with the protective rubber 2 in the mold.
[0040] In a specific embodiment, the nickel leading edge shield 3 is bonded and formed in sections at a distance of 377 mm from the blade tip. Figure 3 The portion A in the middle refers to the segmentation portion of the nickel leading edge shield 3 .
[0041] The following are relevant test data of the blade test piece made by the method of the present invention.
[0042] Test 1: Material-level environmental performance test
[0043] 1. Place the blade test piece in a humid environment (40°C, 95% humidity) for 48 hours, and then test its tensile strength (Mpa) to be 13.7 and elongation at break (%) to be -1. According to the implementation standard GJB 150.9A, the tensile strength (Mpa) is required to be ≥11 and the elongation at break (%) is required to be ≥-30.
[0044] 2. The blade test piece was subjected to ultraviolet radiation aging (100mW / m2). After 72 hours, the tensile strength (Mpa) was tested to be 21.43, the elongation at break (%) was 337, the change rate of tensile strength (%) was -15, and the change rate of elongation at break (%) was -2. According to the implementation standard GJB 150.9A, the tensile strength (Mpa) is required to be ≥11, and the elongation at break (%) is required to be ≥-30. According to the implementation standard GB / T 16422.3, the change rate of tensile strength (%) is required to be ≥-20, and the change rate of elongation at break (%) is required to be ≥-20.
[0045] 3. The blade test piece was subjected to an artificial atmosphere corrosion environment test - a salt spray test (NSS, 96h test, salt spray concentration 50g / L±5g / L, PH value: 6.5~7.2). Finally, the blade test piece did not bubble or fall off, and met the implementation standard GJB150.9A.
[0046] 4. Test the weight change rate (%) of the blade test piece in the 120℃×24h-1# standard oil resistance test. The actual measured value is -7. According to the implementation standard GB / T 1690, the weight change rate (%) of the standard oil resistance test is required to be ≥ -10.
[0047] Test 2: Typical sample test
[0048] A scaled-down model of the blade (without torsion angle) is used to carry out durability tests on steel grit blasting, sand and dust, and impact resistance.
[0049] The scaled model uses two small blades made of aluminum alloy (LY11 GJB2380), with vulcanized leading edges and a rubber coating thickness of 3mm, and undergoes a durability steel grit blasting environmental adaptability test.
[0050] The diameter of the cut wire shot is 2 to 3 mm, the maximum mass is 2 g, the linear velocity is 188 m / s, the maximum momentum is 35.344 J, and the energy generated by the sand and gravel with a diameter greater than 8 mm at a speed of 237.5 m / s is 19.74 J. The steel wire sprayed by the rotating blasting head motor is fan-shaped and sprayed onto the surface of the blade at different angles. The comprehensive effective sandblasting time is 96 h.
[0051] Test results: The unvulcanized rubber part of the blade surface (i.e., the aluminum alloy substrate) was severely worn, with obvious pits; the vulcanized rubber part of the surface, except for slight changes in surface roughness, had a smooth surface, less wear, good appearance, and no cracks or other abnormal phenomena.
[0052] Therefore, by adopting the blade anti-corrosion treatment method provided by the present invention, the finally processed blade can have strong durability, impact resistance, wear resistance and aging resistance, and after actual testing, it meets the relevant standards in humid environment resistance, ultraviolet radiation aging environment resistance, corrosion environment resistance and oil resistant environment. The overall performance is stable and the comprehensive performance is excellent, which ultimately effectively solves the problem of blade corrosion caused by the peeling of the blade paint layer and the wear of the micro-arc oxidation layer.
[0053] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0054] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A method for anti-corrosion treatment of marine propeller blades, It is characterized in that The following steps are involved: S1. Process the metal blade body and reserve space for the required protective rubber on the outer surface of the blade body from the blade root end face to the blade tip of the metal blade body; or, thin the outer surface of the blade body from the blade root end face to the blade tip of the original metal blade as a whole until space for the required protective rubber is thinned; S2. Vulcanize protective rubber on the outer surface of the blade from the root end face to the blade tip of the processed metal blade body or the outer surface of the original metal blade thinning to ensure the original aerodynamic shape of the blade; S3. Wrap the leading edge of the propeller tip with a nickel leading edge shield.
2. A method for anti-corrosion treatment of marine propeller blades according to claim 1, It is characterized in that During the processing, protective rubber is directly injected into the processing mold of the blade, and a nickel leading edge guard is wrapped around the wear-prone part of the leading edge of the blade tip. The protective rubber is vulcanized and formed into one piece with the blade. At the same time, the nickel leading edge guard is directly bonded and wrapped around the leading edge of the blade tip with the help of vulcanized rubber.
3. A method for anti-corrosion treatment of marine propeller blades according to claim 1 or 2, It is characterized in that The thickness of the protective rubber that needs to be vulcanized on the outer surface of the blade is: 2.4 to 3.6 mm at the leading edge of the blade, and 0.7 to 1.1 mm at the rest of the blade.
4. A method for anti-corrosion treatment of marine propeller blades according to claim 1 or 2, It is characterized in that The standard number of protective rubber is GJB5258-2003.
5. A method for anti-corrosion treatment of marine propeller blades according to claim 1, It is characterized in that The length of the nickel leading edge shield is 700 to 1000 mm.
6. A method for anti-corrosion treatment of marine propeller blades according to claim 5, It is characterized in that The thickness of the nickel leading edge shield is 0.4 to 0.8 mm.
7. A method for anti-corrosion treatment of marine propeller blades according to claim 1, 5 or 6, It is characterized in that The nickel leading edge shroud is bonded in sections at the leading edge of the propeller tip to fit the aerodynamic shape of the blade.