1. A method for testing the corrosion resistance of a metal component comprising a metal nut and a connecting piece, characterized by comprising the following steps: 1) selecting a plurality of metal component samples, wherein the metal component samples comprise metal nuts and local connecting pieces connected with the metal nuts, carrying out the same anti-corrosion treatment on the metal component samples, respectively coating different corrosion media on different metal component samples, and marking the different corrosion media; 2) the test box can be subjected to periodic cycle of heating-heat preservation-cooling-heat preservation according to a preset value under a preset humidity; 3) placing the metal component sample coated with the corrosive medium into a test box, and controlling the test box to perform periodic circulation of heating, heat preservation, cooling and heat preservation according to a preset value under a preset humidity; 4) and after the circulation period is finished, opening the test box, and observing and analyzing the metal component sample to obtain the corrosion resistance of the metal component sample to different corrosion media.

2. The method for testing the corrosion resistance of a metal nut as recited in claim 1, wherein the test chamber has a temperature cycle period of: raising the temperature to 70 ℃ within 1-2 hours, keeping the temperature for 8 hours, then lowering the temperature to 10 ℃ within 3-4 hours, keeping the temperature for 10-12 hours, and repeating the temperature cycle for 5-7 times.

Background

Corrosion protection in the aerospace industry is increasingly important. The corrosion problem not only relates to the economic problem, but also aggravates the early entry of the aircraft into overhaul and even seriously jeopardizes the flight safety of the aircraft. The problem of aircraft corrosion has become a key factor in determining the life of the aircraft and guaranteeing the technical and tactical level. The corrosion control concept of the airplane gradually changes the passive countermeasure mainly including repair into protection system engineering, and the whole life cycle of demonstration, design, material selection, manufacture and maintenance of the airplane is realized.

During the manufacturing of the airplane, different coatings are carried out according to different metal materials, and the corrosion resistance and other functions of the material product are improved. The method for evaluating the corrosion resistance of the structure mainly comprises a laboratory accelerated corrosion test and a natural environment exposure test. And (3) evaluating the corrosion resistance of the metal workpiece subjected to surface treatment by mainly adopting a neutral salt spray test method. Such as the process corrosion resistance evaluation and the evaluation of metal parts such as aluminum alloy and the like according to a standard salt spray test method after the surface treatment procedures such as anodic oxidation, painting and the like are carried out on the metal parts.

During the manufacturing and assembly of the airplane, in order to realize certain functional check requirements such as air tightness, air tightness detection media such as neutral soap water, hand sanitizer, laundry detergent and the like can be contacted in the assembly state, and an unfavorable corrosive atmosphere is artificially formed under the condition that the air tightness detection media are not cleaned completely and generate residues.

The corrosion resistance of metal structural parts is an important reference in aircraft maintenance, and particularly, the corrosion resistance of metal structures of the aircraft is different under different service environments. How to rapidly judge the corrosion resistance of the metal structure in different service environments is difficult, and no related technology is used for reference.

Disclosure of Invention

The application aims to provide a method for testing the corrosion resistance of a metal component, which simulates the environments of high and low temperature alternation and damp and hot during the service period of an airplane and judges the corrosion resistance test of a metal structural part.

The field, in particular to a method for testing the corrosion resistance of a metal component. The service environment of the aircraft is that of the aircraft,

in order to quickly detect and evaluate the corrosion resistance of metal components such as aluminum alloy and the like under different temperature, humidity, salinity and contact medium environments, the method especially simulates the service temperature, humidity, medium and other elements of an airplane, determines simulation parameters and a period, performs accelerated test and evaluation on the environmental adaptability of the aviation structure, and guides the follow-up method adoption and improvement.

A method for testing the corrosion resistance of a metal component comprising a metal nut and a connecting piece, characterized by comprising the following steps: 1) selecting a plurality of metal component samples, wherein the metal component samples comprise metal nuts and local connecting pieces connected with the metal nuts, carrying out the same anti-corrosion treatment on the metal component samples, respectively coating different corrosion media on different metal component samples, and marking the different corrosion media; 2) the test box can be subjected to periodic cycle of heating-heat preservation-cooling-heat preservation according to a preset value under a preset humidity; 3) placing the metal component sample coated with the corrosive medium into a test box, and controlling the test box to perform periodic circulation of heating, heat preservation, cooling and heat preservation according to a preset value under a preset humidity; 4) and after the circulation period is finished, opening the test box, and observing and analyzing the metal component sample to obtain the corrosion resistance of the metal component sample to different corrosion media.

The beneficial effect of this application lies in: 1) the service environment of the airplane is simulated through the temperature change of the heat insulation box, the corrosion change of the metal component contacting different corrosion media at different environmental temperatures is given in a short time, and the evaluation conclusion of the corrosion resistance of the metal structural part is given in a short time. 2) Provides a simulation and evaluation method for simulating high and low temperature alternation, damp and hot test and corrosion of a nut. 3) The method is suitable for quickly evaluating surface treatment protection measures of parts during service or after maintenance in the fields of aviation and the like.

The present application is described in further detail below with reference to the accompanying drawings of embodiments:

drawings

FIG. 1 is a schematic diagram of a high and low temperature control cycle curve of a test chamber.

Detailed Description

Referring to the drawings, the present application relates to a method for testing the corrosion resistance of a metal component comprising a metal nut and a connecting member, characterized by comprising the following: 1) selecting a plurality of metal component samples, wherein the metal component samples comprise metal nuts and local connecting pieces connected with the metal nuts, carrying out the same anti-corrosion treatment on the metal component samples, respectively coating different corrosion media on different metal component samples, and marking the different corrosion media; 2) the test box can be subjected to periodic cycle of heating-heat preservation-cooling-heat preservation according to a preset value under a preset humidity; 3) placing the metal component sample coated with the corrosive medium into a test box, and controlling the test box to perform periodic circulation of heating, heat preservation, cooling and heat preservation according to a preset value under a preset humidity; 4) and after the circulation period is finished, opening the test box, and observing and analyzing the metal component sample to obtain the corrosion resistance of the metal component sample to different corrosion media.

The specific embodiment is as follows:

(1) preparing a test piece of a metal component such as aluminum alloy and the like, coating a contact chemical medium on the repaired coating after repairing the coating, and completely drying the contact chemical medium. And observing and recording the surface state of the component test piece and the position of an abnormal phenomenon, such as whether water marks exist or not.

(2) Preparing a qualified high-low temperature alternating test box, setting oven parameters according to cycle set values of temperature rise, heat preservation, temperature reduction, heat preservation and the like required by the figure 1, wherein the cycle period is 5 days.

(3) At room temperature, the test pieces were placed in an oven and the oven door was closed. The temperature is raised to 70 ℃ within 1-2 h, and the temperature is kept for 8 h. Then the temperature is reduced to 10 ℃ within 3 to 4 hours, and the temperature is kept for 10 to 12 hours. And observing and recording the surface state of the component test piece and the position of abnormal phenomena, such as white spots, water marks and the like.

(4) Repeating the cycle periods 1) to 3), and regularly observing and recording the surface state of the component test piece and the position of the abnormal phenomenon.

(5) And when the circulation period is finished, opening the oven door, taking out the metal component test piece such as aluminum alloy and the like, observing and recording the surface state of the component test piece and the position of the abnormal phenomenon, and simultaneously carrying out surface original measurement and analysis on the abnormal phenomenon.

(6) Combining the test processes and results of 1) -5) to obtain the evaluation conclusion of the high and low temperature alternation resistance and the damp-heat corrosion resistance of the metal parts such as aluminum alloy and the like.