• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    The present invention relates to the atmospheric corrosion of copper in sulfide-containing air by weight weight (W) = 3.19 K + 1.55, K = (redness of copper specimens before initial exposure test)-(redness of copper specimens after corrosion) Disclosed is a method of measurement using a function of weight-weight, + (yellowness of copper specimens before initial exposure test)-(yellowness of copper specimens after corrosion).
    公开号:KR19980052658A
    申请号:KR1019960071675
    申请日:1996-12-24
    公开日:1998-09-25
    发明作者:김기태
    申请人:김종진；포항종합제철 주식회사；
    IPC主号:
    专利说明:

    Method for measuring the corrosion of copper in H2S and SO2 containing air using surface color change.
    The present invention relates to a copper corrosion measurement method for measuring copper (Cu) corrosion (weight) by non-destructive method in the air containing H 2 S and / or SO 2 , more specifically using a colorimeter It is a method of determining the weight weight due to atmospheric corrosion of copper by measuring the index value.
    Industrial zones such as steel mills contain H 2 S and / or SO 2 in the air in the tens to thousands of ppD. These sulfides in air are very corrosive, causing severe atmospheric corrosion on materials such as iron and copper. In the case of copper, corrosion product layers (oxidation layers) such as CU 2 S, CU 2 O, and CUO are formed on the surface, resulting in increased electrical resistance of copper and poor electrical contact, resulting in damage or deterioration of electromagnetic plates. . Therefore, in places such as the Institute of Instrument Society of America (ISA), the degree of air corrosion is strictly regulated for the safety of facilities such as electronic calculators installed in factories.
    As a criterion for atmospheric erosion at the American Instruments Association, pure copper (CU) specimens are exposed to the atmosphere to be measured for a period of time (atmospheric exposure test) and then measured by measuring the thickness of the corrosion product layer by electrochemical methods. However, since the thickness of the corrosion product layer has a linear correlation with the weight weight (oxidation weight) due to corrosion, the corrosion degree may be evaluated as the weight weight due to corrosion. In this case, however, the weight value due to corrosion is usually very small, so to measure it accurately, it is necessary to have a very precise and precise balance.
    In order to evaluate the atmospheric corrosion, conventionally, the thickness of the corrosion product layer is measured by using an electrochemical reduction method (ISA standard, ISA-S71.04-1985), or ② the specimen is corroded by an optical microscope or a scanning electron microscope. Take a picture of the layer and use the method of measuring the thickness of the corrosion product layer from that picture. Or ③ The weight gain was measured using a high-precision scale. However, these methods commonly have the disadvantage of requiring expensive equipment for analysis, or requiring a lot of time and effort due to the difficulty of preparing and analyzing specimens. In addition, ④ Korean Patent Application No. 94-40283 discloses a method of measuring the thickness of the oxide layer by observing the adhesion of the surface oxide layer, but the classification of the adhesion degree is only four classifications, there is a problem that the precision is poor.
    An object of the present invention is to solve the above problems, by using a colorimeter to measure the correlation between the color change and corrosion weight weight of the surface corrosion product formation of copper, containing H 2 S and / or SO 2 It provides a method of determining the weight weight of copper due to atmospheric corrosion by measuring copper corrosion (weight) in air in a non-destructive manner.
    The object of the present invention is a method for measuring the atmospheric corrosion degree of copper in the air containing sulfides by weight weight, the weight weight (W) is characterized in that the atmospheric corrosion of the copper characterized in that expressed by the relationship of the color index function Is also achieved by a measuring method.
    W = 3.18 K + 1.55,
    K = δa * + δb *
    Where δa * = (redness of copper specimens before initial exposure test)-(redness of copper specimens after corrosion),
    δ b * = (yellowness of copper specimens before initial exposure test) − (yellowness of copper specimens after corrosion).
    At this time, the condition of the copper specimen before the first exposure test was ISA-S71.04
    -1985 Prepared according to the regulation, pure copper is polished with # 600 abrasive, washed with alcohol, etc. and dried.
    1 is a diagram showing a correlation between a color index and color.
    2 is a graph showing the correlation between the color index function and copper corrosion.
    The configuration and operation of the present invention will be described with reference to the accompanying drawings.
    As a result of measuring the change of weight weight and chromaticity according to atmospheric corrosion by using a colorimeter, there is a precedent relation between corrosion weight weight and color index function K. Where K is represented by Equation 1 as follows.
    [Equation 1]
    Where δa * = (a * of copper specimens before initial exposure test)-(a * of copper specimens after corrosion)
    δb * = (b * of copper specimens before initial exposure test)-(b * of copper specimens after corrosion)
    a * is the redness, the larger this value appears red, the smaller the green color. b * is the yellowness, the larger this value appears yellow, the smaller the blue.
    At this time, the condition of the copper specimen before the initial exposure test is ISA-S71. Refers to the preparation prepared according to 04-1985. Pure copper is polished with # 600 abrasive, washed with alcohol, and dried.
    In general, any arbitrary color can be represented by the chromaticity index size of L * , a * , b *, etc., as shown in FIG. Such chromaticity can be easily measured with a color difference meter, which distinguishes the color from the values obtained. As shown in FIG. 1, the closer the value of L * is to 100, the brighter it is. On the contrary, if the value of L * is close to 0, the color is dark. In addition, the larger the a + value toward the + side, the more reddish color. On the contrary, the larger the-value, the greener the color.
    Hereinafter, embodiments of the present invention will be described in detail.
    H 2 shows the S and / or SO 2 A change of the copper corrosion (weight by weight) in the color index function in accordance with the K value of the air contained in the Fig. 2. As shown in Figure 2 there is a linear relationship between the corrosion weight weight and the color index function, the relationship is expressed as Equation 2 below.
    [Equation 2]
    Where W = weight (microgram / cm 2 ) and K = δa * + b * ,
    However, since the coefficient of Equation 2, 3.19, -1.55, etc. may be slightly changed according to the number of experimental data, the above relation can be expressed by Equation 3 below.
    [Equation 3]
    here, K = δa * + δb * , m, n = constant = constant.
    Thus, the color index a of the copper specimen*, b*It is possible to estimate the corrosion weight simply by measuring the function K, and it can be seen that it is a corrosion evaluation method that can drastically reduce the time and cost of specimen preparation and analysis compared to various evaluation methods used in the past. .
    权利要求:
    Claims (2)
    [1" claim-type="Currently amended] Method for measuring the atmospheric corrosion of copper in the air containing sulfides by weight weight, the weight weight (W) is expressed by the formula of the color index function as follows
    [expression]

    Where δa * = (redness of copper specimens before initial exposure test)-(redness of copper specimens after corrosion)
    δb * = (yellowness of copper specimens before initial exposure test)-(yellowness of copper specimens after corrosion)
    [2" claim-type="Currently amended] The method of claim 1,
    A method for measuring atmospheric corrosion of copper in sulfide-containing air, characterized by M = 3.19 and N = 1.55.
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    同族专利:
    公开号 | 公开日
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    法律状态:
    1996-12-24|Application filed by 김종진, 포항종합제철 주식회사
    1996-12-24|Priority to KR1019960071675A
    1998-09-25|Publication of KR19980052658A
    优先权:
    申请号 | 申请日 | 专利标题
    KR1019960071675A|KR19980052658A|1996-12-24|1996-12-24|Method for measuring the corrosion of copper in H2S and SO2 containing air using surface color change|
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