Method for evaluating corrosion resistance of oxide skin on surface of hot rolled steel plate

Abstract

The invention discloses a method for evaluating corrosion resistance of oxide skin on the surface of a hot rolled steel plate. The method comprises the following steps: (1) selecting hot rolled steelplates with oxide skin of different colors on the surfaces for cutting to obtain samples, and keeping the oxide skin on the surfaces from being damaged in the cutting process; (2) intermittently soaking the sample in a sodium chloride solution for corrosion weight increment, or placing the sample in a damp and hot environment for corrosion weight increment, then taking a picture and weighing, anddrying before taking the picture and weighing; and (3) selecting the relation between two indexes of corrosion area acceleration and weight increment rate and time to respectively evaluate the corrosion resistance of the oxide skin on the surface of the hot rolled steel plate, wherein the larger the corrosion area acceleration is, the smaller the corrosion resistance is, and the smaller the corrosion area acceleration is, the larger the corrosion resistance is; and the larger the weight increment rate is, the smaller the corrosion resistance is, and the smaller the weight increment rate is, the larger the corrosion resistance is. The method for evaluating corrosion resistance of oxide skin on the surface of the hot rolled steel plate can rapidly evaluate the corrosion resistance of the oxide skin; and the corrosion resistance of the hot rolled steel plate can be simulated indoors in the atmosphere and severe marine environment.

Description

technical field [0001] The invention relates to a method for detecting steel properties, in particular to an evaluation method for the corrosion resistance of oxide scales on the surface of hot-rolled steel plates. Background technique [0002] Hot-rolled steel sheets often go through a period of warehousing and logistics processes from delivery to application. During this period, due to the exposure of the steel sheets to the atmospheric environment or even the harsh marine atmospheric environment, the hot-rolled steel sheets may be corroded to varying degrees, which directly affects the steel. delivery quality, while the surface quality and corrosion resistance of hot-rolled plates and strips have always been important aspects to measure the quality of steel plates, directly affecting the appearance and quality stability of steel plates during storage and transportation, and how to quickly evaluate hot-rolled The corrosion resistance of the oxide scale on the steel plate s...

AI Technical Summary

Problems solved by technology

[0002] Hot-rolled steel sheets often go through a period of warehousing and logistics processes from delivery to application. During this period, due to the exposure of the steel sheets to the atmospheric environment or even the harsh marine atmospheric environment, the hot-rolled steel sheets may be corroded to varying degrees, which directly affects the steel. delivery quality, while the surface quality and corrosion resistance of hot-rolled plates and strips have always been important aspects to measure the quality of steel plates, directly affecting the appearance and quality stability of steel plates during storage and transportation, and how to quickly evaluate hot-rolled The corrosion resistance of the scale on the surface of the steel plate has become a common concern of rolling experts, corrosion scholars and logistics managers, but there is no detection and evaluation method for the corrosion resistance of the scale on the surface of the hot-rolled steel plate.

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