QCT484-1999标准（英文版）.doc

Instruction for Change of Standard NumberAccording to the requirements of standard letter 1998 No.216 of State Bureau of Quality Technical Supervision and the reply of State Bureau of Machine Building Industry to 1999 No.126, the standard number JB/Z 111-86 is changed to industrial standard number QC/T 484-1999 with the content unchanged. The new standard number shall be used for the reference.JB/Z 111 88Technical Guidance Document of Ministry of Machine Building Industry of the Peoples Republic of ChinaPaint Coating for AutomobileJB/Z 111 88Superseding JB/Z 111-74This standard applies to paint coating for automobile, but not to paint coating of electrical devices and instruments of automobile.1Specifications of Paint Coating CodeAccording to different application conditions of automobile parts and quality requirements for painting and specifications in Table 1, paint coatings are divided into 10 groups and several grades.Table 1Paint Coating CodeGroup NameGradeName of Paint CoatingRemarksTQ1BodyABFirst-grade decorative and protective coatingCommon decorative and protective coatingTQ2Car bodyABHigh-grade decorative coatingFirst-grade decorative and protective coatingApplicable to custom carsApplicable to coatings of compact carsTQ3Wagon boxesABCorrosion resistant decorative coatingRot resistant decorative coatingApplicable to iron wagon boxesApplicable to wooded wagon boxes and iron-wooden wagon boxesTQ4Car frame, wheel splash guardFirst-grade rot resistant coatingTQ5EngineProtective coating (quick drying)TQ6Chassis TQ7Work blank, semi-finished product of pressing, springABCommon corrosion resistant coatingRot resistant coatingTQ8Special coatingABCDAcid resistant coatingGasoline resistant coatingHeat resistant coatingSoundproof, thermal isolating and wear resistant coatingApplicable to storage battery tank and its bracketApplicable to inner surface of petrol tankApplicable to exhaust pipe of mufflerTQ9Water tank, steel plate, springWaterproof antirust coatingTQ10Interior trimmingsApplicable to interior trimmings of cars and passenger cars of different sizes2Technical Requirements2.1Main quality indicators of paint coatings are specified in Table 2 according to groups and grades of paint coating codes.Table 2Paint Coating CodeGradeCharacteristics of CoatingMain Quality Indicators of CoatingApplication ExamplesRemarksTQl AIt is a high-quality, decorative and protective coating with the excellent weather resistance, water resistance, decorative performance and mechanical strength and it applies to the wet tropical zone.1.Appearance of Paint Film:It shall be smooth and free of the particles, but the minor orange peel. The light color shall be uniform and free of scratch.Gloss: gloss coating shall not be less than 90, and flat coating shall not be more than 30.2 Thickness of Paint FilmFor the priming paint coating, it shall not be less than 15m, and for the finishing paint coating, it shall not be less than 40m. The total thickness shall not be less than 55m.3.Mechanical Strength:Cab of truck and covering parts, bus compartment, off-road vehicle, jeep body, as well as the parts of above assemblies and small and medium parts with the same requirements for weather resistance and decorative performance1. After the application of priming coating, the outer surface of underbody and the inner surface of fender shall be coated with soundproof, wear resistant and heat isolating paints (see TQ8-T), and the weld connection shall be coated with sealant.2 Aluminum products shall be applied with pure zinc yellow phenolic or epoxy priming paint.(3) The covered parts of inner surface of body may not be sprayed with finishing paint.4 To improve the corrosion resistance of body, the coated body cavity and the uncoated structural cavity shall be sprayed with anti-rust wax.GlossFlatImpact forceElasticityHardnessAdhesive force40kg cm3mm0.4Grade 130kg cm5mm0.5Grade 14 Weather Resistance:The coating shall be still complete after the exposure in the region of Guangzhou or Hainan for two years or after four years of use (ie, it shall be free of bubbling, pulverization, rust and crack), with the gloss loss rate not greater than 30% and without significant discoloration.5.Corrosion Resistance It shall be qualified after 700h of salt fog test according to 4.1.11a). It shall be free of perforation corrosion or structural damage due to corrosion after five years of use in the south of Yangtze River (200,000 km). Water Resistance:After 20 cycles in 50C water, the thickening is allowable but the bubbling shall be avoided.7.Alkali ResistanceAfter 4h of test according to 4.1.8 b), burns shall be avoided but the slight discoloration is allowable.8.Acid Resistance:Table 2 (Cont)Paint Coating CodeGradeCharacteristics of CoatingMain Quality Indicators of CoatingApplication ExamplesRemarksIt shall be free of burns and spot but slight discoloration after 24h.9.Petrol Resistance:It shall be free of discoloration after 4h of Immersion in RQ-70 petrol.10 Oil Resistance: It shall be free of discoloration after 48h of Immersion in HQ-10 petrol.TQ1BIt is general decorative and protective coating with the performance and mechanical strength similar with TQ1 A but poorer water resistance, weather resistance, corrosion resistance etc. It applies to the temperate and boreal climatic conditions1. Appearance and thickness of paint film shall be identical with TQ1 A.2. Mechanical Strength:Impact force40kgcm;Elasticity3mm;Hardness0.4;Adhesive force: class 13.Weather Resistance:The coating shall be still complete after the exposure in the region of Guangzhou or Hainan for two years or after three years of use with the gloss loss rate not greater than 60% and without significant discoloration.4.Corrosion Resistance: It shall be qualified after 240h of salt fog test according to 4.1.11a. It shall be free of perforation corrosion or structural damage due to corrosion after three years of use in the south of Yangtze River (120,000 km).5. After 5 cycles in 50C water, it shall be stable.6.Alkali, acid, oil and petrol resistances shall be identical with TQ1 A.Same as aboveSame as aboveTQ2AIt is an advanced decorative coating with the very good decorative performance, weather resistance and water resistance. It applies to a variety of climatic conditions1 Appearance of Paint FilmIt shall be smooth, free of particle and bright as a mirror with the gloss not less than 9002.Thickness of Paint FilmFor the priming paint coating, it shall not be less than 20m, for the intermediate coating, it shall be from 40 to 50m (not including the nylon layer), and for the finishing paint coating, it shall be from 60 to 80m.3.Mechanical Strength not including the nylon layer):Impact force20kgcm:Elasticity10mm;Hardness0.6;Adhesive force: class 14.Corrosion Resistance: It shall be qualified after 700h of salt fog test according to 4.1.11a. It shall be free of perforation corrosion or structural damage due to corrosion after eight years of use.5Water ResistanceAfter 10 cycles in 50C water, the thickening is allowable but the bubbling shall be avoided.6.Temperature Fluctuation ResistanceIt shall keep stable from +60 to -40 (ie: it shall not crack after 10 cycles of temperature fluctuation).7.Weather, alkali, acid and petrol resistances shall be identical with TQ1 A.Custom car body and covering parts and the compact car body with higher decorative performance1Outer surface of underbody, inner surface of top cover and inner surface of covering parts shall be painted with soundproof, wear resistant and heat isolating paints (see TQ81)TQ2BIt is a high-quality, decorative and protective coating with the excellent decorative performance, weather resistance and water resistance, where the decorative performance is only less than TQ2A, and the mechanical strength is higher than TQ2A. It applies to a variety of climatic conditions.1.Appearance of Paint Film:It shall be smooth where the minor orange peel is allowable. The light color shall be uniform and not less than 90. The appearance surface shall be free of particle.Gloss: gloss coating shall not be less than 90, and flat coating shall not be more than 30.2.Thickness of Paint FilmFor the priming paint coating, it shall not be less than 20m, for the intermediate coating, it shall not be less than 30m, and for the finishing paint coating, it shall not be less than 40m.3.Mechanical Strength not including the nylon layer):Impact force30kgcm:Elasticity50mm;Hardness0.6;Adhesive force: class 14. Weather, corrosion, water, alkali, acid and oil resistances shall be identical with TQ1 A.5.Temperature Fluctuation Resistance shall be identical with TQ2A.Compact car body and immediate/light truck cab and covering parts, and touring car body with higher quality requirementsSame as TQ1 ATQ3 AAIt is corrosion resistant decorative coating with the excellent weather resistance, mechanical strength and corrosion resistance, where the decorative performance poorer than TQ11.Appearance of Paint Film:Minor orange peel is allowable, and the light color shall be uniform, but the exposure and serious rill mark are unallowable.2 Thickness of Paint FilmFor the priming paint coating, it shall not be less than 15m, and for the finishing paint coating, it shall not be less than 30m. The total thickness shall not be less than 45m.3.Mechanical Strength:Impact force50kgcm:Elasticity1mm;Hardness0.3;Adhesive force: class 14Weather ResistanceIt shall be free of serious gloss loss and discoloration after two years of use in the south (excluding the mechanical damage), but the slight pulverization is allowable. Outer surfaces of metal parts of iron compartment and iron-wood compartment, dump tank and petrol tankInner cavity of metal structure parts (such as side panel) shall be coated with paint or through the rust treatmentTQ3BIt is corrosion resistant decorative coating with the excellent weather resistance and mechanical strength. It can be used as the coating of woodware.1.Appearance of Paint Film:Minor orange peel is allowable, and the light color shall be uniform, but the exposure and serious rill mark are unallowable.2.Mechanical Strength:Impact force: 50kgcm:Elasticity1mm;Hardness0.3;3Total thickness shall not be less than 40m4Weather ResistanceIt shall be free of serious gloss loss and discoloration after half and a years of use (excluding the mechanical damage), but the slight pulverization is allowable.Outer surface of wood compartment and iron-wood compartment1. Woodware moisture content shall not be more than 18%. 2. In the tropical zone, there are following requirements for the cars: covered positions between the woodware and the positions covered by metal parts shall be first coated with the mildew resistant paint.TQ4It is high-quality corrosion resistant coating with the excellent salt fog resistance, water resistance and mechanical strength. It applies to the parts with harsh application conditions and higher corrosion resistance, such as the parts under the car contacting with soil and water.1.Appearance of Paint Film:Paint film shall be smooth, and the slight rill marks are allowable, but the pinhole and spots are unallowable.2 The total thickness shall not be less than 40m.3.Mechanical Strength:Impact force: 50kgcm:Elasticity: 1mm;Hardness0.6;4Salt Fog ResistanceIt shall be qualified after 500h.5Water ResistanceAfter 20 cycles in 50C water, it shall be stable.6 Alkali, acid, petrol and oil resistances shall be identical with TQ1 A.Various parts of wheel such as pedal, fender, fan, petrol tank bracket and tank belt, fender bracket, cover plate of inspection holes on the underbody, chassis parts such as U-type bolt steel plate spring tug and ring braking system, fixing bracket of water tank, spare tyre bracket, etc.Except the wearing parts like pedal, fender and fan, the thickness of paint film of other parts shall be not less than 20un, but its water resistance and salt fog resistance shall meet the requirements of this standard.TQ5It is a protective coating with the excellent oil resistance, petrol resistance and quick drying. Generally, it applies to the workpieces which contact with oil and petrol or are not for high-temperature drying.1.Appearance of Paint Film:Paint film shall be uniform and not able to expose.2 The total thickness shall not be less than 40m.3.Mechanical Strength:Impact force40kgcm:Elasticity3mm;Hardness0.54Salt Fog ResistanceIt shall be qualified after 150h.5Water ResistanceAfter 3 cycles in 50C water, it shall be stable.6Petrol ResistanceIt shall be free of change after 44h of immersion in RQ-70 petrol.7 Oil Resistance: It shall be free of change after 48h of immersion in HQ-10 oil at 80.Engine assembly and transmission assemblyThis group of casting blanks and stampings shall be coated with priming paint to prevent the rust in the processing before the assembly.TQ 6It is a protective coating with the excellent corrosion resistance and oil resistance. 1.Appearance of Paint Film:Paint film shall be uniform and not able to expose.2 The total thickness shall not be less than 40m.3.Mechanical Strength:Impact force40kgcm:Elasticity3mm;Hardness0.34Corrosion ResistanceIt shall be qualified after 150h of salt fog test according to 4.1.11a or 150h of salt water test according to 4.1.11b.5Water ResistanceAfter 3 cycles in 50C water, it shall be stable.6Petrol ResistanceIt shall be free of change after 2h of immersion in RQ-70 petrol.7 Oil Resistance: It shall be free of change after 48h of immersion in HQ-10 oil.Front, intermediate and rear axle assemblies, transmission shaft, braking system of steering parts, part winch, shock absorber, jack assembly.Same as aboveTQ7AIt is an antirust coating (or priming paint coating), and has adhesive force on the metal surface and good antirust performance and mechanical strength. It applies to the antirust coatings of blanks and parts (or priming paint coating)1. Paint film shall be smooth, and the slight rill marks are allowable, but the pinhole and spots are unallowable.2 Thickness of Paint Film: Not less than 205m.3.Mechanical Strength:Impact force:50kgcm:Elasticity: 1mm;Hardness0.44Corrosion ResistanceIt shall be qualified after 200h of salt fog test according to 4.1.11a.5Water ResistanceAfter 3 cycles in 50C water, it shall be stable.6Alkali ResistanceIt shall be free of bubbling and shedding after the test according to 4.1.8a. Softening is allowable and it shall recover after 2h.7 Oil Resistance: It shall be free of change after 250h of immersion in HQ-10 oil at 60.Various casting blanks, metal connecting parts of iron-wood compartment, engine, transmission, stampings on the transfer case axle assembly (such as oil pan cover plate clutch cover etc.), air reservoir, seat back spring, small parts on the body (such as pressure strip, door glass frame and sliding groove, etc), compressor pipe and oil filter housing1. Parts contacting oil (such as cylinder body, transmission, transfer case, inner surface of axle shell). Coatings with higher requirements for oil resistance shall meet the standards. The oil resistance of coatings of other parts may be identical with TQ 1 A.2. Alkali resistance is to prevent the paint film shedding in the alkali water cleaning during the processing and after the assembly.3. The processing surface of blank may not be coated.4. The surface of this group of workpieces shall be coated after the assembly. The parts with harsh application conditions shall be phosphated (such as the oil pan, etc). TQ7BIt is a corrosion resistant coating with the excellent permeability corrosion resistance for woods and the acid resistance. 1. Appearance of Paint Film: It shall be smooth and not able expose, and the slight rill marks are allowable.2 Thickness of Paint Film: Not less than 20m.3.Acid Resistance:It shall not be free of burns and discoloration.Various wooden base platesTQ8AIt is an acid resistant coating1.Appearance of Paint Film:Paint film shall be smooth, and the pinhole, spots and exposure are unallowable.2 Thickness of Paint Film:Not less than 40m.3.Mechanical Strength:Impact force: 50kgcm:Elasticity: 1mm;Hardness0.3;4Acid Resistance:It shall be stable after 48h of immersion in the sulfuric acid solution with the 1.32 of specific gravity and 4.0% of concentration.Workpieces of storage battery bracket contacting with sulfuric acidTQ8BIt is a petrol resistant coating1.Appearance of Paint Film:Paint film shall be smooth, and the pinhole and spots are unallowable.2 Thickness of Paint Film:Not less than 30m.3.Mechanical Strength:Impact force: 50kgcm:Elasticity: 1mm;Hardness0.5;4Water Resistance:It shall be stable after 10h of immersion in the boiling water at 100.5Petrol ResistanceIt shall be free of change after 48h of immersion in RQ-70 petrol at 80.Parts on the inner surface of petrol tank and oil groove contacting the petrolTQ8CIt is a heat resistant coating 1. Appearance and thickness shall be identical with TQ 8B.2. Mechanical Strength:Impact force: 30kgcm:Elasticity5mm;3. Corrosion ResistanceIt shall be qualified after 240h of salt fog test according to 4.1.11a or 300h of sa