This standard specifies the terminology, selection of measurement methods, determination of reference planes and measurement of local thickness of thermal spray coatings for non-destructive measurement. This standard applies to all thermal spraying methods, including the thickness measurement and evaluation of non-magnetic coatings on various magnetic metal substrates and non-conductive coatings on non-magnetic metal substrates prepared by flame spraying, arc spraying, plasma spraying, etc. GB/T 11374-1989 Non-destructive measurement method for thickness of thermal spray coatings GB/T11374-1989 Standard download decompression password: www.bzxz.net
This standard specifies the terminology, selection of measurement methods, determination of reference planes and measurement of local thickness of thermal spray coatings for non-destructive measurement. This standard applies to all thermal spraying methods, including the thickness measurement and evaluation of non-magnetic coatings on various magnetic metal substrates and non-conductive coatings on non-magnetic metal substrates prepared by flame spraying, arc spraying, plasma spraying, etc.

National Standard of the People's Republic of China
Non-destructive measurement method for thickness of thermal spraying coatingsGH11374-89
This standard adopts the international standard IS02064 "Definition and practice for the determination of thickness of metallographic and other non-organic coatings" and ISO2063 "Metallic coatings for corrosion protection of steel - Spraying of aluminum, zinc and their alloys". 1 Subject content and scope of application
1.1 Subject content
This standard specifies the terminology for thickness measurement of thermal spraying coatings, the selection of measurement methods, the determination of reference planes and the measurement of local thickness: 1.2 Scope of application
This standard is applicable to all thermal spraying methods, including the thickness measurement and evaluation of non-magnetic coatings on various magnetic metal substrates and non-conductive coatings on non-magnetic metal substrates prepared by flame spraying, arc spraying, plasma spraying, etc. 2 Reference standards
GD4956 Magnetic metal substrate. Non-magnetic double coating thickness measurement Magnetic method GB4957 Non-conductive coating thickness measurement on non-magnetic metal substrate Eddy current method 3 Terminology
3.7 Effective surface
Surface that must be sprayed according to the use and appearance requirements, including the sprayed and to-be-sprayed surfaces. 3.2 Measuring surface
The area on the effective surface where a single measurement is made. For non-destructive methods, it is the area of ​​the probe or the area that affects the reading. 3.3 Reference surface
The area on the effective surface where the coating thickness is measured for a specified number of times. 3.4 Local thickness
The average value of the coating thickness obtained by measuring a specified number of times on the reference surface. 3.5 Minimum local thickness
The minimum value of the local thicknesses obtained on the effective surface of a specimen. 3.6 Maximum local thickness
The maximum value of the local thicknesses obtained on the effective surface of a specimen. 3.7 Average thickness
The average value of the local thickness values ​​uniformly distributed on the effective surface for a specified number of times. 4 Selection of measurement methodbzxz.net
Select the measurement method according to whether the substrate material and the coating material have magnetic and electrical conductivity. Approved by the State Administration of Technology Supervision 1989-06-29, January 1, 1990
4.1 Magnetic method (GB4956)
GB 11374..89
This method is applicable to the thickness measurement of non-magnetic coatings on magnetic metal substrates. Non-magnetic coatings prepared on magnetic metal substrates by any thermal spraying process can be measured by this method for non-destructive thickness measurement. 4.2 Eddy current method (GB4957)
This method is applicable to the thickness measurement of non-conductive coatings on non-magnetic metal substrates. Non-conductive coatings prepared on non-magnetic metal substrates by any thermal spraying process can be measured by this method for non-destructive thickness measurement. 5 Determination of reference surface 5.1 Size of reference surface 5.1.1 For workpieces with effective surface less than 1 cm2, the reference surface used to measure local thickness shall be the entire effective surface of the test piece. 5.1.2 For workpieces with effective surface greater than 1 cm2, the area of ​​each reference surface used to measure local thickness shall be 1 cm2 (a square with a side length of 1 cm2 is preferred). 5.1.3 For workpieces with effective surface greater than 1 cm2, the area of ​​each reference surface used to measure local thickness may be increased to 1 cm2. 5.2 Determination of number and position of reference surfaces The number of reference surfaces shall be determined so that the total area of ​​the reference surface is not less than 5% of the effective surface area. The positions of the reference surfaces shall be evenly distributed over the entire effective surface. 6 Measurement of local thickness 6.1 Number of points for local thickness measurement 6.1.1 For workpieces with effective surface less than 1 cm2, 1 to 3 points shall be measured. 6.1.2 For workpieces with effective surface less than 1cm, make 3~5 point measurements in the selected reference plane. 6.1.3 For workpieces with effective surface greater than 1m, make 9 point 10 measurements in the selected reference plane, and the first measurement should coincide with the tenth measurement.
6.2 The arrangement of measurement points is as follows:
“Point measurement disk
一, Point measurement display
Note, × is the measurement point, and the single number is the measurement sequence number. Three-point measurement area
Nine-point ten-time film measurement
Four-point measurement
Five-point measurement area
7 Thickness report
GB11374
7.1 For coatings for different purposes, the average thickness, minimum local thickness or Maximum and minimum thickness 7.2
If there is no special provision, the thickness of the thermal spray coating shall be reported as the minimum local thickness measured on the effective surface. Additional remarks:
This standard is proposed by the Ministry of Machinery and Electronics Industry of the People's Republic of China. This standard is under the jurisdiction of the National Technical Committee for the Promotion of Metal and Non-metal Covering Standards. This standard was drafted by the Wuhan Institute of Materials Protection, and the participating drafting units include the 725th Institute of the State Shipbuilding Corporation and the Shenyang Metal Research Institute. The main drafters of this standard are Wang Hongsheng and Zhang Jishu.
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