CN102692378B - Method for measuring prestrain of sample in metal organic coating environment test - Google Patents
Method for measuring prestrain of sample in metal organic coating environment test Download PDFInfo
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- CN102692378B CN102692378B CN201210157013.0A CN201210157013A CN102692378B CN 102692378 B CN102692378 B CN 102692378B CN 201210157013 A CN201210157013 A CN 201210157013A CN 102692378 B CN102692378 B CN 102692378B
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Abstract
The invention relates to a method for measuring the prestrain of a sample in a metal organic coating environment test. The method comprises the following steps of: implementing continuous loading and application of the prestrain on a metal organic coating sample by a mechanical device and measuring the strain capacity by an original calibration and microscopic observation method; then placing the metal organic coating sample applied with different strain levels into an accelerated aging test box or the natural environment to carry out environment test; and finally, evaluating the combined action of the coating strain and the aging factor by detecting the protection performance of a metal organic coating. The testing method is suitable for simulating the conditions that the coating is subjected to various stresses or strains in the serving process and a testing means is provided for searching the environmental age-resistant performance of the coating under the loaded or deformed condition.
Description
Technical field
The present invention is the method for sample prestrain in a kind of metal organic coating environmental test, belongs to metal organic coating environmental test technical field.
Background technology
Concerning metal material, organic coating is one of means of the most effectively implementing protection, but the coating system that organic coating metal protected with it forms is in actual military service process, inevitably can suffer the effect of mechanics factor.These mechanics factors may cause due to coating internal factor, as the cure shrinkage of organic coating; Also may derive from outside Service Environment, the distortion and the stress condition etc. that cause as humiture in Service Environment.Practical engineering experience shows: when mechanics factor and environmental factor stack, it is more obvious that the failure procedure of organic coating often becomes, and becomes the weak link of whole organic coating system.Therefore, many researchers have introduced mechanics factor in the Research on Environmental Test of evaluating coating performance, simulate the force and deformation situation in coating system military service process with this.At present in to the test method of metal organic coating layer surface stress application and strain, the main load test method that remains metal material of using for reference, as the preload preparation method of sample of U-shaped bend specimen stress loading method, ASTM G49 and the ASTM G39 of ASTM G30 etc.But, because these test methods are mainly applicable to metal material, to the continuous Loading Control of metal surface organic coating unreliable, many research even directly adopts the loading index of metal to be used as the loading index of coating, lacks the measuring method to metal organic coating actual loading and distortion.
Summary of the invention
The present invention designs for above-mentioned problems of the prior art the method that sample prestrain in a kind of metal organic coating environmental test is provided just, its objective is as quantitative test and evaluates metal organic coating and stand the environmental aging test sampling after stress and strain effect.
The object of the invention is to be achieved through the following technical solutions:
The method of sample prestrain in this kind of metal organic coating environmental test, is characterized in that: the step of the method is:
(1) the preparation of metal organic coating sample
Prepare two ends porose (3), be convenient to bending narrow bullion organic coating sample (2), and portray original marking line (5) along its length at the center of metal organic coating sample (2), the length of original marking line (5) is no more than 1mm;
(2) on metal organic coating sample (2), apply prestrain
2.1 carry out prebuckling by three-point bending method to narrow bullion organic coating sample (2), make it to form one arc;
Then 2.2 be placed on metal organic coating sample (2) on a fixture, it is arc that this fixture forms before metal organic coating sample (2) is held in, and can regulate continuously the size of arc metal organic coating sample (2) span simultaneously;
(3) use reading microscope (11) to observe and measure original marking line (5) at metal organic coating sample (2) surface changing value along its length.
Keep the fixture of metal organic coating sample (2) archwise to comprise threaded rod (6), fixing fixture block (8), movable clip block (7) and nut (9), in nut (9), fixing fixture block (8), between the hole (3) at metal organic coating sample (2) two ends and movable clip block (7), pass threaded rod (6), the two ends of metal organic coating sample (2) are against between fixing fixture block (8) and movable clip block (7), movable clip block (7) can slide in the horizontal direction along the extension arm (10) of fixing fixture block (8), control the size of the span of arc metal organic coating sample (2) by the nut (9) of continuous adjusting threaded rod (6).
The present invention by applying the painting ply strain of varying level on metallic coating specimen surface, simulate with this mechanics factor effect that coating system is suffered, and by measuring the size of determining quantitatively the surface strain of metal organic coating sample, make condition and the actual Service Environment of metal organic coating sample in environmental test more approaching, obtain environmental suitability evaluation result more accurately.
Brief description of the drawings
Fig. 1 is the shape schematic diagram of metal organic coating sample of the present invention
Fig. 2 is the vertical view of Fig. 1
Fig. 3 is the schematic diagram of 3 prebucklings of metal organic coating sample of the present invention
Fig. 4 is that metal organic coating sample of the present invention is arranged on the structural representation on fixture
Embodiment
Below with reference to drawings and Examples, technical solution of the present invention is further described:
Shown in accompanying drawing 1～4, a kind of method of sample prestrain in metal organic coating environmental test, is characterized in that: the step of the method is:
(1) the preparation of metal organic coating sample
Preparation two ends are porose 3, be convenient to bending narrow bullion organic coating sample 2, the test piece length of sample 2 is 150～200mm, width is 15～20mm, thickness is 1.5～2mm, and portray original marking line 5 along its length at the center of metal organic coating sample 2, the length of original marking line 5 is no more than 1mm;
(2) on metal organic coating sample 2, apply prestrain
2.1 carry out prebuckling by three-point bending method to narrow bullion organic coating sample 2, make it to form one arc, accompanying drawing 3 is for to utilize three-point bending method metal organic coating sample to be applied to the schematic diagram of prebuckling, in figure, 1 is semicircle cylindricality pressure head, and 2 of dotted line signal is by the sample after prebuckling, 4 is semicircle pillar support, requiring semicircle cylindricality pressure head radius R is 20 millimeters, is 40 across thickness rate l/H, and the distance that pressure head declines is 30 millimeters;
Then 2.2 be placed on metal organic coating sample 2 on a fixture, fixture requires high, the good rigidly, not perishable or aging of the strength of materials adopting, it is arc that this fixture forms before metal organic coating sample 2 is held in, and can regulate continuously the size of arc metal organic coating sample 2 spans simultaneously;
(3) observe and measure original marking line 5 at metal organic coating sample 2 surfaces length along its length and the changing value of length with reading microscope 11.With changing value unit of account elongation, the strain using unit elongation amount as metal organic coating sample 2 surface coatings, the measuring accuracy of reading microscope requires to reach 0.001 millimeter.
Keep the fixture of metal organic coating sample 2 archwises to comprise threaded rod 6, fixing fixture block 8, movable clip block 7 and nut 9, at nut 9, fixing fixture block 8, between the hole 3 at metal organic coating sample 2 two ends and movable clip block 7, pass threaded rod 6, the two ends of metal organic coating sample 2 are against between fixing fixture block 8 and movable clip block 7, metal organic coating sample 2 deformation of archwise can not be recovered, movable clip block 7 can slide in the horizontal direction along the extension arm 10 of fixing fixture block 8, control the size of the span of arc metal organic coating sample 2 by the nut 9 of continuous adjusting threaded rod 6.
The prestrain metal organic coating sample 2 and the fixture entirety that complete are put into environmental test equipment, according to researcher's the barrier propterty that need to select the laboratory test methods such as salt-fog test, period soaking corrosion test, solar radiation test, damp and hot Alternating Test to examine to apply metal organic coating after differently strained level.Also can directly render to and in natural atmosphere environment, carry out exposure test applying prestrain metal organic coating sample 2 after differently strained level and fixture entirety.
After test, can carry out ocular estimate according to need to the selecting loss of gloss, variable color, get rusty of researcher, foaming, mildew, general gold, the index such as ftracture, come off, also can detect to assess by other physicochemical properties other performance change of metal organic coating.
The present invention compared with prior art, can control the painting ply strain of metal organic coating sample surfaces quantitatively, makes condition and the actual Service Environment of metal organic coating sample in environmental test more approaching, obtains environmental suitability evaluation result more accurately.
Claims (1)
1. a method for sample prestrain in metal organic coating environmental test, is characterized in that: the step of the method is:
(1) the preparation of metal organic coating sample
Prepare two ends porose (3), be convenient to bending narrow bullion organic coating sample (2), and portray original marking line (5) along its length at the center of metal organic coating sample (2), the length of original marking line (5) is no more than 1mm;
(2) on metal organic coating sample (2), apply prestrain
2.1 carry out prebuckling by three-point bending method to narrow bullion organic coating sample (2), make it to form one arc;
Then 2.2 be placed on metal organic coating sample (2) on a fixture, it is arc that this fixture forms before metal organic coating sample (2) is held in, and can regulate continuously the size of arc metal organic coating sample (2) span simultaneously;
Described fixture comprises threaded rod (6), fixing fixture block (8), movable clip block (7) and nut (9), in nut (9), fixing fixture block (8), between the hole (3) at metal organic coating sample (2) two ends and movable clip block (7), pass threaded rod (6), the two ends of metal organic coating sample (2) are against between fixing fixture block (8) and movable clip block (7), movable clip block (7) can slide in the horizontal direction along the extension arm (10) of fixing fixture block (8), control the size of the span of arc metal organic coating sample (2) by the nut (9) of continuous adjusting threaded rod (6),
(3) use reading microscope (11) to observe and measure original marking line (5) at metal organic coating sample (2) surface changing value along its length;
(4) the prestrain metal organic coating sample (2) and the fixture entirety that complete are put into environmental test equipment, according to researcher's the barrier propterty that need to select the test of salt-fog test, period soaking corrosion, solar radiation test, damp and hot Alternating Test laboratory test methods to examine to apply metal organic coating after differently strained level, directly render to and in natural atmosphere environment, carry out exposure test applying prestrain metal organic coating sample (2) after differently strained level and fixture entirety.
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| CN103743627B (en) * | 2013-12-26 | 2016-01-20 | 中国石油集团钻井工程技术研究院江汉机械研究所 | A kind of hot spray coating toughness device for quick testing and using method |
| CN103983559B (en) * | 2014-04-16 | 2016-07-13 | 深圳大学 | Reinforcing bar plays suggestion device and the reminding method of rust and chlorine ion concentration limit state |
| CN104568717B (en) * | 2014-12-26 | 2017-10-24 | 大连理工大学 | Consider the corrosion testing apparatus and constant temperature experiments supporting device of bending stress influence |
| CN106185732A (en) * | 2016-07-26 | 2016-12-07 | 四川然新材料科技有限公司 | A kind of elevating mechanism for solderability test |
| CN108088754B (en) * | 2017-11-28 | 2020-09-15 | 芜湖蓝博塑胶有限公司 | Air conditioner plastic casing detection working device |
| CN110108556A (en) * | 2019-04-16 | 2019-08-09 | 中国人民解放军陆军装甲兵学院 | A kind of method and system of prediction brittle coating cracking |
| CN110286015A (en) * | 2019-06-28 | 2019-09-27 | 江苏中利集团股份有限公司 | A kind of heatproof impact test sampling instrument |
| CN113237776B (en) * | 2021-05-31 | 2022-03-25 | 青岛中和聚氨酯材料有限公司 | Polyurethane high-temperature illumination deformation detection device and detection method thereof |
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