CN112924256A - Preparation method of corrosion test piece surface salt film - Google Patents
Preparation method of corrosion test piece surface salt film Download PDFInfo
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- CN112924256A CN112924256A CN202110128661.2A CN202110128661A CN112924256A CN 112924256 A CN112924256 A CN 112924256A CN 202110128661 A CN202110128661 A CN 202110128661A CN 112924256 A CN112924256 A CN 112924256A
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- test piece
- corrosion test
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/286—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q involving mechanical work, e.g. chopping, disintegrating, compacting, homogenising
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/32—Polishing; Etching
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
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- Health & Medical Sciences (AREA)
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- Testing Resistance To Weather, Investigating Materials By Mechanical Methods (AREA)
Abstract
The invention discloses a preparation method of a salt film on the surface of a corrosion test piece.A corrosion test piece is put into hot water for preheating after being polished, the test piece is taken out after absorbing sufficient heat, and the water on the surface of the corrosion test piece is quickly absorbed by filter paper; adopt push type alcohol to spout the salt solution after the bottle sprays the atomizing and spout corrosion coupon surface, utilize the liquid evaporation to dryness in the test piece absorbed heat with corrosion coupon surface salt solution, can adopt the air heater to blow the test piece simultaneously in order to improve the evaporation rate of test piece surface liquid, wait to form the salt film on corrosion coupon surface after liquid evaporates completely. The preparation method is simple to operate and easy to realize, and corrosion of the corrosion test piece cannot be caused during sample preparation.
Description
Technical Field
The invention belongs to the technical field of corrosion control, and particularly relates to a preparation method of a salt film on the surface of a corrosion test piece.
Background
Salt deposits, high humidity environments and the presence of oxygen are the main causes of corrosion that causes the thermal power plant to be out of service. The thermal power plant generally adopts the mode that the hot stove discharges water to maintain the boiler system, and after stopping the stove, the salt that deposits in the heat transfer pipeline can separate out in long-term operation, if humidity control is improper in the system, the corrosion of stopping use of equipment can be caused after the air leaks into. Dry air maintenance and nitrogen charging maintenance are common shutdown anticorrosion measures for thermal equipment, wherein the dry air maintenance has strict requirements on humidity, and the humidity is generally required to be controlled to be less than 50%. In the nitrogen filling maintenance, the nitrogen purity is limited, namely the nitrogen purity is not less than 98%, but the humidity is not strictly limited, and only residual water is required to be discharged from equipment, but a thermodynamic system is huge, and the humidity in the system is generally difficult to ensure in the nitrogen maintenance process. Under the condition that salt is accumulated in the equipment and the humidity is more than 50%, whether the residual oxygen in the system can cause the corrosion of the equipment or not is not reported, and relevant tests are required to verify. The key point of the test is to prepare a corrosion test piece with a salt film and prevent the corrosion of the test piece in the preparation process of the salt film. In the prior art, the test piece is generally heated to a high temperature by an electric furnace, and then the salt solution is applied to the surface of the sample by brushing or spraying to form a salt film. In the implementation process of the method, one surface of the test piece needs to be in contact with the heating plate for a long time, so that only one testing surface of the test piece can be coated with the salt. The implementation temperature is high, which easily causes oxidation, corrosion and the like of the test piece, and changes the original characteristics of the test piece.
Disclosure of Invention
In order to solve the problems of the prior art, an object of the present invention is to provide a method for preparing a salt film on a surface of a corrosion test piece, which is simple and easy to implement, and does not cause corrosion of the corrosion test piece during sample preparation.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing a salt film on the surface of a corrosion test piece comprises the following steps:
step 1: polishing the corrosion test piece: grinding the mechanically processed corrosion test piece by using waterproof abrasive paper, further grinding and polishing the corrosion test piece if the corrosion test piece needs to be subjected to surface polishing treatment after the corrosion test piece reaches 800# waterproof abrasive paper, then putting the corrosion test piece into an absolute ethyl alcohol cleaning solution for cleaning, and then taking out and drying by using cold air;
step 2: preheating a corrosion test piece: fixing the polished test piece, putting the test piece into hot water to ensure that the test piece absorbs sufficient heat, and quickly sucking residual water on the surface of the corrosion test piece by using filter paper after the corrosion test piece is taken out of the hot water;
and step 3: salt spraying: adopt push type alcohol to spout the salt solution after the bottle sprays the atomizing and spout the corrosion test piece surface, utilize the liquid evaporation of corrosion test piece absorptive heat in with the salt solution, adopt the air heater to blow the evaporation rate in order to improve corrosion test piece surface liquid to corrosion test piece simultaneously, treat that liquid forms the salt film on the corrosion test piece surface after evaporating completely.
Preferably, the type of the material of the corrosion test piece comprises silicon steel, carbon steel, stainless steel, aluminum alloy and copper alloy.
Preferably, the hot water preheated by the corrosion test piece is one of desalted water, deionized water or distilled water, and the heating mode of the hot water is an electric furnace, a water bath or an oil bath.
Preferably, the preheating hot water temperature of the corrosion test piece is 90-95 ℃, and the preheating time is 30 s.
Preferably, the salt solution is prepared by first dissolving the salt in a small amount of demineralized, deionized or distilled water, then adding anhydrous ethanol in an amount of 9 times the volume of the demineralized, deionized or distilled water to form a salt solution, and adding the salt solution to the push-type alcohol spray bottle.
Compared with the prior art, the invention has the following advantages:
1) the method is simple to operate and easy to realize.
2) The corrosion of the corrosion test piece is not caused during the sample preparation.
Drawings
FIG. 1 is a macro-photograph of a silicon steel corrosion test piece after salt coating and after salt film removal.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific embodiments.
A preparation method of a salt film on the surface of a corrosion test piece comprises the following steps: firstly, polishing a silicon steel corrosion test piece subjected to mechanical processing according to relevant requirements by using waterproof abrasive paper, after the silicon steel corrosion test piece reaches 800# waterproof abrasive paper, putting the corrosion test piece into an absolute ethyl alcohol cleaning solution for cleaning, taking out the silicon steel corrosion test piece, drying the silicon steel corrosion test piece by using cold air, and binding the test piece by using a nylon rope; then, dissolving 1g of NaCl in 10mL of desalted water, adding 90mL of absolute ethyl alcohol to form a salt solution, and adding the salt solution into the press type alcohol spray bottle; placing a beaker filled with 500mL of demineralized water into a water bath to heat the beaker to 90 ℃, then placing the silicon steel corrosion test piece into hot water to keep the temperature for 30s, and quickly sucking residual water on the surface of the test piece by using filter paper after the corrosion test piece is taken out of the hot water; and finally, spraying the atomized NaCl salt solution onto the surface of the corrosion test piece by using a press type alcohol spray bottle, evaporating the liquid in the salt solution on the surface of the corrosion test piece by using the heat absorbed by the test piece, blowing the test piece by using an air heater, and forming a salt film after the liquid on the surface of the silicon steel corrosion test piece is completely evaporated. FIG. 1 shows a macro-photograph of a silicon steel corrosion test piece after coating with salt and after removing the salt film.
Claims (5)
1. A preparation method of a salt film on the surface of a corrosion test piece is characterized by comprising the following steps:
step 1: polishing the corrosion test piece: grinding the mechanically processed corrosion test piece by using waterproof abrasive paper, further grinding and polishing the corrosion test piece if the corrosion test piece needs to be subjected to surface polishing treatment after the corrosion test piece reaches 800# waterproof abrasive paper, then putting the corrosion test piece into an absolute ethyl alcohol cleaning solution for cleaning, and then taking out and drying by using cold air;
step 2: preheating a corrosion test piece: fixing the polished test piece, putting the test piece into hot water to ensure that the test piece absorbs sufficient heat, and quickly sucking residual water on the surface of the corrosion test piece by using filter paper after the corrosion test piece is taken out of the hot water;
and step 3: salt spraying: adopt push type alcohol to spout the salt solution after the bottle sprays the atomizing and spout the corrosion test piece surface, utilize the liquid evaporation of corrosion test piece absorptive heat in with the salt solution, adopt the air heater to blow the evaporation rate in order to improve corrosion test piece surface liquid to corrosion test piece simultaneously, treat that liquid forms the salt film on the corrosion test piece surface after evaporating completely.
2. The method of claim 1, wherein the method comprises the steps of: the material types of the corrosion test piece comprise silicon steel, carbon steel, stainless steel, aluminum alloy and copper alloy.
3. The method of claim 1, wherein the method comprises the steps of: the hot water preheated by the corrosion test piece is one of desalted water, deionized water or distilled water, and the heating mode of the hot water is an electric furnace, a water bath or an oil bath.
4. The method of claim 1, wherein the method comprises the steps of: the preheating hot water temperature of the corrosion test piece is 90-95 ℃, and the preheating time is 30 s.
5. The method of claim 1, wherein the method comprises the steps of: the salt solution is prepared by dissolving salt in a small amount of desalted water, deionized water or distilled water, adding 9 times of anhydrous ethanol to form a salt solution, and adding the salt solution into a push type alcohol spray bottle.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110128661.2A CN112924256A (en) | 2021-01-29 | 2021-01-29 | Preparation method of corrosion test piece surface salt film |
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| CN202110128661.2A CN112924256A (en) | 2021-01-29 | 2021-01-29 | Preparation method of corrosion test piece surface salt film |
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| CN112924256A true CN112924256A (en) | 2021-06-08 |
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| CN202110128661.2A Pending CN112924256A (en) | 2021-01-29 | 2021-01-29 | Preparation method of corrosion test piece surface salt film |
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| JPH01130762A (en) * | 1987-11-16 | 1989-05-23 | Nisshin Steel Co Ltd | Production of corrosion resistant surface treated steel sheet excellent in fingerprint resistance and electrical conductivity |
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| CN110132826A (en) * | 2019-04-12 | 2019-08-16 | 西北工业大学 | The test method of nickel-base high-temperature single crystal alloy hot corrosion resistance |
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| CN111896458A (en) * | 2020-06-22 | 2020-11-06 | 西北工业大学 | Method for analyzing thermal corrosion performance of nickel-based single crystal superalloy |
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2021
- 2021-01-29 CN CN202110128661.2A patent/CN112924256A/en active Pending
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| JPH01130762A (en) * | 1987-11-16 | 1989-05-23 | Nisshin Steel Co Ltd | Production of corrosion resistant surface treated steel sheet excellent in fingerprint resistance and electrical conductivity |
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| CN205374257U (en) * | 2015-11-17 | 2016-07-06 | 中国石油大学(华东) | Simulation naval air environment's automatic acceleration corrosion test device |
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| CN108014987A (en) * | 2017-11-30 | 2018-05-11 | 成都龙泉马龙机械厂 | A kind of anti-alkaline etching ground spraying method of mechanical part |
| CN108103483A (en) * | 2017-12-28 | 2018-06-01 | 烟台杰瑞石油装备技术有限公司 | A kind of valve body surface face protective process technology |
| CN110132826A (en) * | 2019-04-12 | 2019-08-16 | 西北工业大学 | The test method of nickel-base high-temperature single crystal alloy hot corrosion resistance |
| CN111020571A (en) * | 2020-01-15 | 2020-04-17 | 中北大学 | Alloy powder for laser cladding of stainless steel surface and application thereof |
| CN111323364A (en) * | 2020-04-21 | 2020-06-23 | 中国航发沈阳发动机研究所 | Thermal corrosion test device and method for homogenized deposited salt |
| CN111896458A (en) * | 2020-06-22 | 2020-11-06 | 西北工业大学 | Method for analyzing thermal corrosion performance of nickel-based single crystal superalloy |
| CN112195471A (en) * | 2020-09-16 | 2021-01-08 | 上海交通大学 | Corrosive agent for lath martensite steel original austenite grain boundary, preparation method and corrosion method |
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