Coating process: steel structure fireproof coating thickness detection

Core tip: when determining the thickness of fireproof coating for steel structure, the coating quality applied to steel structure shall be calculated within the structural load, but shall not exceed the allowable range 1 Testing instrument Mc-2000 D type coating thickness gauge is adopted, with the measurement range of 0-9000 μ m, measurement error: thickness value × 3% ± 1 μ m, minimum indication value of 1 μ m, operating environment temperature: 0 ℃ ~ + 40 ℃, relative humidity no more than 90%, minimum thickness of matrix: 0.2mm, minimum plane of matrix: 7mm Paint knowledge | precautions for wall paint color selection Recommended introduction: when painting the wall, the owner sometimes has difficulty in choosing what color of the wall paint to paint In fact, there is no ugly color in the wall paint, only the disharmonious color matching The use of wall color contains the knowledge of health Too strong color will stimulate people's perception, make people have a sense of fidgety, affect people's mental health Grasp the basic principles of wall color and paint a colorful space 1、 Wall paint color selection notice 1 Light color is generally used for the top surface Light colors make people feel light, dark colors make people feel heavy Usually, the treatment of rooms is from top to bottom, from shallow to deep For example, the ceiling and walls of rooms are white and Coating House News: when determining the thickness of fireproof coating for steel structure, the coating quality applied to steel structure shall be calculated within the structural load, but shall not exceed the allowable range 1 Mc-2000 D type coating thickness gauge is used as the testing instrument, with the measurement range of 0-9000 μ m, measurement error: thickness value × 3% ± 1 μ m, minimum indication value of 1 μ m, operating environment temperature: 0 ℃ ~ + 40 ℃, relative humidity no more than 90%, minimum thickness of matrix: 0.2mm, minimum plane of matrix: 7mm, minimum curvature radius: concave: 6mm, convex: 1.5mm 2, operation method (1) boot: first take the probe line inserted on the instrument, then press the "open" button, the instrument enters the self checking state (the distance between the probe and the iron base or magnetic field is above 10cm), and the main display area is reduced from 99 to 0 until it enters the measurement state (2) calibration: after calibration, the parameter is stored in the instrument to facilitate the direct measurement after the transfer After the instrument is powered on, it can be calibrated directly from the iron base Put the probe on the blank of the tested piece (be sure to polish it) or use the iron-based test block brought along with it, and a value (0 or other) will be displayed on the screen Hold the probe with one hand, and hold the side of the instrument with the other hand After the iron-based calibration, point to the sample 1, take off the probe, put the sample 1 (109 μ m) on the iron-based, take the probe for measurement, and a value will be displayed on the screen Press and hold the probe by hand, press and hold the side After the calibration of sample 1, point to sample 2 Remove the probe, put the No.2 sample (3113 μ m) on the iron base, put the probe for measurement, the screen displays a value, hold the probe still, hold the side sample for calibration and point to No.0 sample At this time, after two kinds of samples are calibrated, they can be measured directly, or two kinds of samples can be respectively placed on the calibration iron base If they are out of the error range, they can be recalibrated The method is as follows: press the "No." key, and the instrument will call out the current calibration sample number for display If they are not out of tolerance samples, press and hold the "No." key, and the sample number will be displayed from 0 to 2 cycles to the approved calibration Sample number, release the "number" key To recalibrate the No 2 sample, put the No 2 sample into the iron base to measure a value, press and hold the probe, press "HL", the next calibration sample number will be displayed on the screen, and the calibration is completed It can be measured directly (3) Storage in measurement state: in measurement state, the screen displays the latest measurement value If you need to store and press the "et" key on the side of the instrument, the storage address will automatically add 1 If you need to store, you can re measure 3 Precautions (1) magnetization of base metal: the magnetic measurement is affected by the magnetic change of base metal (in practical application, the magnetic change of low carbon steel can be considered as slight) In order to avoid the influence of heat treatment, cold working and other factors, the instrument should be calibrated with iron substrate with the same properties as the plated metal (2) Base metal thickness: each instrument has a critical thickness of the base metal If the thickness is greater than this, the measurement will not be affected by the base metal thickness (3) Edge effect: this instrument is sensitive to the abrupt change of specimen surface, so it is not reliable to measure near the edge or inner corner of specimen The curvature of the specimen has an effect on the measurement, which increases with the decrease of the curvature radius Therefore, it should not be measured on the bending surface of the test piece that exceeds the allowable radius of curvature (4) Surface roughness: matrix metal and surface roughness have influence on measurement The influence increases with the increase of roughness Rough surfaces can cause systematic and accidental errors In each measurement, the number of measurements is increased in different positions to overcome this accidental error If the base metal is rough, the zero point of the instrument must be calibrated at several positions on the uncoated rough similar base metal test piece; or the zero point of the instrument must be calibrated after removing the coating layer on the base metal with non corrosive solution (5) Magnetic field: the strong magnetic field produced by various surrounding electrical equipment will seriously interfere with the work of magnetic thickness measurement (6) Adherent: this instrument is sensitive to adherent materials that prevent the probe from contacting the surface of the coating Therefore, it is necessary to remove the attached material to ensure that the probe is in direct contact with the surface of the coating (7) Position of probe: the placement of the probe has an impact on the measurement, so that the probe and the sample surface remain vertical during the measurement (8) Reading times: usually the readings of the instrument are not exactly the same Therefore, it is necessary to take several measurement values within each measurement area The local difference of the thickness of the covering layer also requires measurement within a given area, especially when the surface is rough 4 In the selected area, at least 5 points are measured according to the measurement results; for the beam and column in the selected position, 6 and 8 points are measured respectively Their average values are calculated to the nearest 0.5mm Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,