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Method for preparing corrosion pit in metal material sample

A metal material and corrosion pit technology, which is applied in the field of metal material sample pretreatment, can solve the problems of long preparation period of corrosion pit and the lack of general applicability of the preparation method to metal materials, and achieves remarkable effect.

Pending Publication Date: 2020-07-10
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Description
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  • Application Information

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Problems solved by technology

[0004] In view of this, the purpose of the present invention is to provide a method for preparing corrosion pits on metal material samples, to solve the problem that the metal material sample corrosion pits in the prior art have a long preparation period, and the preparation method has no universal applicability to metal materials. The problem

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  • Method for preparing corrosion pit in metal material sample
  • Method for preparing corrosion pit in metal material sample
  • Method for preparing corrosion pit in metal material sample

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preparation example Construction

[0029] Core of the present invention is to provide a kind of method for preparing corrosion pit on metal material sample, and its preparation method comprises the following steps:

[0030] S1, sample processing blind hole: please refer to figure 1 , mark the position where the corrosion pit needs to be prepared in sample 1, use a bench drill to process the blind hole 2 at the marked position, the depth of the processed blind hole 2 is 0.3~0.4mm smaller than the target depth of the corrosion pit, and the processed blind hole 2 The diameter is 0.9~1.2mm smaller than the target diameter of the corrosion pit;

[0031] S2. Insulation and sealing treatment: Place the sample 1 with the blind hole processed in step S1 in analytical pure alcohol for 20 minutes for ultrasonic cleaning to remove the organic dirt on the surface, dry the sample after ultrasonic cleaning, and then immerse it in the burner. Heat the melted paraffin liquid until the surface of the sample is completely sealed...

Embodiment 1

[0038] (1) Test material: 35CrNiMoV low-alloy high-strength steel fatigue sample, the sample picture is as follows image 3 Shown: where the value of L1 is 118mm, the value of L2 is 30mm, the value of L3 is 28.02mm, the value of L4 is 10mm, the value of L5 is 20mm, A means that the arc radius here is 70mm, and the thickness of the sample is 4mm.

[0039] (2) Test objective: prepare a semi-elliptical corrosion pit about 5mm in length, 5mm in width and 1.5mm in depth in the center of the fatigue sample.

[0040] (3) Test method: S1. Prepare a 1.1mm deep blind hole with a Ф4mm diameter drill in the center of the fatigue sample;

[0041] S2. After cleaning the sample with alcohol, immerse it in heated and melted paraffin until the entire surface of the sample is completely sealed by paraffin, and remove the paraffin at the position of the blind hole with a metal pointed needle.

[0042] S3. Use the lead plate as the cathode, connect it to the negative pole of the DC constant cur...

Embodiment 2

[0045] (1) Test material: 7075 aluminum alloy four-point bending stress corrosion specimen, the sample diagram is as follows Figure 4 Shown: where the value of L6 is 70mm, the value of L7 is 10mm, and the thickness of the sample is 4mm.

[0046] (2) Test objective: prepare a semi-elliptical corrosion pit about 4mm in length, 4mm in width and 1.5mm in depth in the center of the fatigue sample.

[0047] (3) Test method: S1. Prepare a 1.1mm deep blind hole with a Ф3mm diameter drill in the center of the fatigue sample;

[0048] S2. After cleaning the sample with alcohol, immerse it in heated and melted paraffin until the entire surface of the sample is completely sealed by paraffin, and remove the paraffin at the position of the blind hole with a metal pointed needle.

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Abstract

The invention discloses a method for preparing a corrosion pit on a metal material sample. The method comprises the following steps: marking the position where the corrosion pit needs to be prepared on the sample, and processing a blind hole at the marked position; carrying out ultrasonic cleaning on the sample with the machined blind hole, drying the sample subjected to ultrasonic cleaning, immersing the sample into heated and melted paraffin liquid until the surface of the sample is completely sealed by paraffin, taking out the sample from the paraffin liquid, and removing the paraffin at the position of the blind hole; taking a lead plate as a cathode, taking the sample as an anode, taking a mixed solution of 5-10% of sodium chloride and 8-20% of hydrochloric acid as an electrolytic solution, placing the lead plate and the sample in the electrolytic solution in parallel, and performing constant-current electrolysis by using a direct-current power supply to accelerate the corrosion of the blind hole position, thereby obtaining the target corrosion pit. According to the preparation method, rapid preparation of various types of common metal material corrosion pits can be achieved,the sizes of the corrosion pits can be manually controlled, and the problems that an existing metal material corrosion pit preparation method is long in period and does not have universality are solved.

Description

technical field [0001] The invention relates to the technical field of pretreatment of metal material samples, in particular to a method for rapidly preparing corrosion pits on metal material samples. Background technique [0002] With the use of more and more metal load-bearing components in coastal environments and marine conditions, the failure of components induced by corrosion pits is also increasingly exposed. In order to solve the failure problem of such components, it is necessary to analyze the failure mechanism and carry out experimental verification, and the simulated working condition laboratory accelerated test with corrosion pit samples is an important research method. Therefore, how to quickly prepare corrosion pits on the test samples before the accelerated test in the simulated working condition laboratory has become a key problem to be solved urgently. [0003] The existing corrosion pit preparation technology mainly adopts the chemical immersion method in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32
CPCG01N1/32
Inventor 陈沛张欣耀高宇昊马江南张雅斐查小琴
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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