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A quantitative evaluation device and test method for exfoliation corrosion performance of 7n01 aluminum alloy

A technology of exfoliation corrosion and aluminum alloy, which is applied in the field of aluminum alloy, can solve the problems of high subjectivity and inability to quantitatively evaluate the difference of corrosion performance, etc., and achieve the effect of simple equipment, simple structure and uniform corrosion process

Active Publication Date: 2020-12-18
NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Judging the corrosion level based on visual inspection results is highly subjective and cannot quantitatively evaluate the difference in corrosion performance

Method used

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  • A quantitative evaluation device and test method for exfoliation corrosion performance of 7n01 aluminum alloy
  • A quantitative evaluation device and test method for exfoliation corrosion performance of 7n01 aluminum alloy
  • A quantitative evaluation device and test method for exfoliation corrosion performance of 7n01 aluminum alloy

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as Figure 1~3As shown, a quantitative evaluation device for the exfoliation corrosion performance of 7N01 aluminum alloy includes an upper backing plate 1, a lower backing plate 2, and a measuring cylinder 3. Both the upper backing plate 1 and the lower backing plate 2 are plexiglass plates, and the A pair of set screws 4 are connected; the center of the upper backing plate 1 is provided with a through hole 7 for placing the measuring cylinder 3, the length and width of the groove 6 are greater than the diameter of the through hole 7, and the groove The width of 6 is smaller than the width of the lower backing plate 2, and this setting can ensure that the exfoliation corrosion solution soaks the aluminum alloy sample 5 without flowing out of the lower backing plate 2; A rubber pad 8 is provided, the rubber pad 8 includes a cylinder 801 and a bottom pad 802, the cylinder 801 is arranged close to the inner wall of the through hole 7, the measuring cylinder 3 is arra...

Embodiment 2

[0046] A quantitative evaluation device for exfoliation corrosion performance of 7N01 aluminum alloy, comprising an upper backing plate 1, a lower backing plate 2, and a measuring cylinder 3, the upper backing plate 1 and the lower backing plate 2 are organic glass plates, and a Connect to the fixing screw 4; the center of the upper backing plate 1 is provided with a through hole 7 for placing the measuring cylinder 3, the length and width of the groove 6 are greater than the diameter of the through hole 7, and the width of the groove 6 Smaller than the width of the lower backing plate 2, this setting can ensure that the exfoliation corrosion solution infiltrates the aluminum alloy sample 5 without flowing out of the lower backing plate 2; rubber is provided between the through hole 7 and the measuring cylinder 3. Pad 8, the rubber pad 8 includes a cylinder 801 and a bottom pad 802, the cylinder 801 is arranged close to the inner wall of the through hole 7, the measuring cylind...

Embodiment 3

[0057] A quantitative evaluation device for exfoliation corrosion performance of 7N01 aluminum alloy, comprising an upper backing plate 1, a lower backing plate 2, and a measuring cylinder 3, the upper backing plate 1 and the lower backing plate 2 are organic glass plates, and a Connect to the fixing screw 4; the center of the upper backing plate 1 is provided with a through hole 7 for placing the measuring cylinder 3, the length and width of the groove 6 are greater than the diameter of the through hole 7, and the width of the groove 6 Smaller than the width of the lower backing plate 2, this setting can ensure that the exfoliation corrosion solution infiltrates the aluminum alloy sample 5 without flowing out of the lower backing plate 2; rubber is provided between the through hole 7 and the measuring cylinder 3. Pad 8, the rubber pad 8 includes a cylinder 801 and a bottom pad 802, the cylinder 801 is arranged close to the inner wall of the through hole 7, the measuring cylind...

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Abstract

The invention discloses a quantitative evaluation device for the exfoliation corrosion performance of a 7N01 aluminum alloy. The device comprises an upper base plate, a lower base plate and a measuring cylinder; the upper base plate is fixedly connected with the lower base plate; the center of the upper base plate is provided with a through hole and a rubber pad; the rubber pad comprises a cylinder and a bottom pad; the cylinder is tightly attached to the inner wall of the through hole; the measuring cylinder is arranged in the cylinder; multiple rows of permeation holes are symmetrically formed in the bottom pad; a liquid leakage hole is formed in the center of the bottom of the measuring cylinder; a groove is formed in the center of one surface, connected with the lower base plate, of the lower base plate; and a water bath cavity is formed in the periphery of the groove. Based on the quantitative evaluation device, an aluminum alloy sample is firstly processed, then a three-dimensional morphology of exfoliation corrosion is obtained in combination with a laser confocal microscope, a non-corrosive part is taken as a reference plane, and a quantitative value of the maximum depth ofthe exfoliation corrosion is obtained; and the device has the advantages of being simple in equipment and convenient to operate, solves the problem that the subjectivity of evaluating the corrosion grade by visual inspection of the morphology is excessively strong is solved, and can be used for analyzing and observing the exfoliation corrosion performance of the 7N01 aluminum alloy in different heat treatment states.

Description

technical field [0001] The invention relates to the technical field of aluminum alloys, and more specifically, relates to a quantitative evaluation device and testing method for exfoliation corrosion performance of 7N01 aluminum alloy. Background technique [0002] The 7000 series aluminum alloy is a heat treatable strengthened aluminum alloy with medium strength, excellent processability and weldability. Among many aluminum alloys, 7N01 aluminum alloy is widely used in aerospace vehicles and rail transit due to its good mechanical properties, corrosion resistance, thermal stability and welding performance. In recent years, with the rapid development of high-speed trains in my country, 7N01 aluminum alloy has gradually become one of the main materials for aluminum alloy profiles for rail transit. [0003] Exfoliation corrosion refers to that in a certain corrosive medium, the corrosion starts from the surface of the metal material and expands along the grain boundary parall...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N17/00
CPCG01N17/006
Inventor 李帅王星星刘中英杨杰上官林建
Owner NORTH CHINA UNIV OF WATER RESOURCES & ELECTRIC POWER
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