Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee on Surfactant and Detergent of Standardization Administration of China (SAC/TC 272).
Metal cleaner
1 Scope
This standard specifies the product classification, requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of metal cleaner.
This standard is applicable to general cleaners for cleaning common metal materials and metal parts and components. This product is mainly composed of surfactant and various additives or solvents.
This standard is not applicable to metal cleaners for special purposes (such as aircraft cleaning).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6368 Surface active agents - Determination of pH of aqueous solution - Potentiometric method
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 13173 Surface active agents - Detergents - Testing methods
QB/T 1323 Detergents - Determination of surface tension - Ring pull-up liquid-film method
QB/T 1324 Determination of water content in surfactants for detergents - Karl Fischer double solution method
QB/T 2951 Inspecting rules for detergent products
3 Product classification
The product is classified into water-based metal cleaner and solvent-based metal cleaner according to the type of solvent medium in use. Wherein, water-based metal cleaner is classified into non-rustproof type and rustproof type. Water-based (non-rustproof) metal cleaner does not have specific rust-proof performance. Water-based (rustproof) metal cleaner is classified into the following five categories according to their applicability to metals:
Category I: applicable to steel (carbon steel, stainless steel, etc.);
Category II: applicable to cast iron;
Category III: applicable to copper and copper alloy;
Category IV: applicable to aluminum and aluminum alloy;
Comprehensive: combination of two or more of the above four categories of commonly used metals, for example, "comprehensive (Categories I&II)" or "comprehensive (Categories I&II&III&IV)" respectively represents the combination of Categories I and II or Categories I~IV.
4 Requirements
Water-based metal cleaners and solvent-based metal cleaners shall meet those specified in Table 1 and Table 2 respectively.
Table 1 Index requirements for water-based metal cleaners
Item Index
Non-rustproof type Rustproof type
Category I Category II Category III Category IV Comprehensive
Appearance Liquid products Uniform, free of delamination and precipitation
Slurry products Uniform paste, free of agglomeration and obvious segregation
Powdery (or granular) products Uniform, free of agglomeration
3% (mass fraction) aqueous solution Free of delamination, precipitation and foreign matter
Moisture and volatile matter Liquid products/% ≤ 80
Slurry products/% ≤ 50
Powdery (or granular) products/% ≤ 30
pH [3% (mass fraction) aqueous solution, 25℃] ≥7.0 7.0~11.5
Cleaning power [3% (mass fraction) aqueous solution, 60℃]/% ≥ 80
Foam performance (50±2)℃/mm ≤ Instant height: 80; height after 5min: 20 (applicable to pressure spray-washing products)
Corrosivity [(80±2)℃, 2h] 45# steel Appearance/grade 0 0 — — — Corrosivity and rust resistance shall be tested by selecting corresponding metal test pieces according to the express categories of samples, and the limits shall meet the requirements of each individual category
Corrosion amount/mg ≤ 2 2 — — —
Z30 cast Iron Appearance/grade ≤ 1 — 1 — —
Corrosion amount/mg ≤ 2 — 2 — —
H62 brass Appearance/grade ≤ 1 — — 1 —
Corrosion amount/mg ≤ 3 — — 3 —
LY12 duralumin Appearance/grade 0 — — — 0
Corrosion amount/mg ≤ 2 — — — 2
Rust resistance [(35±2)℃, RH(90±2)%, 24h] 45# steel/grade Not required 0 — — —
Z30 cast iron/grade ≤ — 1 — —
H62 brass/grade ≤ — — 1 —
LY12 duralumin/grade — — — 0
Rinsing performance (stainless steel sheet) Free of visible cleaner residues
Stability at high temperature [(60+2)℃, 6h] Liquid products Uniform, free of delamination
Slurry products Uniform paste, free of separation
Stability at low temperature [(-5±2)℃, 24h] Liquid products Uniform, free of delamination, crystallization or precipitation
Slurry products Uniform paste, free of separation by crystallization and obvious segregation
Total content of phosphorus pentoxide/% ≤ 1.1 (applicable to phosphorus-free products)
Note: In the corrosion test, if the corrosion amount is negative (except for the negative value caused by system error, with a result of not greater than 0.3mg), it is judged that this item is not in conformity.
Table 2 Index requirements for solvent-based metal cleaners
Item Index
Appearance Uniform, free of delamination and precipitated liquid
Odor Slight solvent odor
Content of non-volatile matter (in 100g sample)/% ≤ 0.5
Acidity (calculated by HCl/100g)/% ≤ 1.0
Corrosivity 45# steel Corrosion amount/mg ≤ 1
Appearance/grade 0
Z30 cast Iron Corrosion amount/mg ≤ 1
Appearance/grade 0
LY12 duralumin Corrosion amount/mg ≤ 1
Appearance/grade 0
H62 brass Corrosion amount/mg ≤ 1
Appearance/grade 0
Moisture/% ≤ 0.3
Surface tension/(mN/m) ≤ 30
Volatility (tsample/tether) ≤ 3
5 Test methods
Unless otherwise stated, only recognized analytically pure reagents and Grade III water specified in GB/T 6682 are used for the analysis.
5.1 Metal test piece
5.1.1 Material and specification of test piece
The dimension of test piece is shown in Figure 1. Materials and specifications used in the test include:
a) 45# steel, 50mm×25mm×(3~6)mm;
b) Z30 Grade I cast iron, 50mm×25mm×(3~6)mm;
c) H62 brass, 50mm×25mm×(3~6)mm;
d) LY12-BC2 duralumin, 50mm×25mm×(3~6)mm;
e) 1Cr18Ni9Ti stainless steel, 50mm×25mm×(3~6)mm.
5.1.2 Polishing and cleaning of test piece
Spread 240# abrasive cloth on the flat plate, and polish the test piece in a direction parallel to the long side of the test piece. Wipe up the polished test piece with absorbent gauze or absorbent cotton, hang it on the S-shaped hook, immerse it in anhydrous ethanol, and then scrub it with absorbent gauze or absorbent cotton clamped by tweezers. Then, transfer the test piece into acetone or petroleum ether at 30~60℃ for rinsing, dry it with hot air, and hang the clean test piece with S-shaped hook on the test piece rack for later use.
Foreword i
1 Scope
2 Normative references
3 Product classification
4 Requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation and storage
Annex A (Normative) Determination of acidity
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by China National Light Industry Council.
This standard is under the jurisdiction of the National Technical Committee on Surfactant and Detergent of Standardization Administration of China (SAC/TC 272).
Metal cleaner
1 Scope
This standard specifies the product classification, requirements, test methods, inspection rules, as well as marking, packaging, transportation and storage of metal cleaner.
This standard is applicable to general cleaners for cleaning common metal materials and metal parts and components. This product is mainly composed of surfactant and various additives or solvents.
This standard is not applicable to metal cleaners for special purposes (such as aircraft cleaning).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
GB/T 6368 Surface active agents - Determination of pH of aqueous solution - Potentiometric method
GB/T 6682 Water for analytical laboratory use - Specification and test methods
GB/T 13173 Surface active agents - Detergents - Testing methods
QB/T 1323 Detergents - Determination of surface tension - Ring pull-up liquid-film method
QB/T 1324 Determination of water content in surfactants for detergents - Karl Fischer double solution method
QB/T 2951 Inspecting rules for detergent products
3 Product classification
The product is classified into water-based metal cleaner and solvent-based metal cleaner according to the type of solvent medium in use. Wherein, water-based metal cleaner is classified into non-rustproof type and rustproof type. Water-based (non-rustproof) metal cleaner does not have specific rust-proof performance. Water-based (rustproof) metal cleaner is classified into the following five categories according to their applicability to metals:
Category I: applicable to steel (carbon steel, stainless steel, etc.);
Category II: applicable to cast iron;
Category III: applicable to copper and copper alloy;
Category IV: applicable to aluminum and aluminum alloy;
Comprehensive: combination of two or more of the above four categories of commonly used metals, for example, "comprehensive (Categories I&II)" or "comprehensive (Categories I&II&III&IV)" respectively represents the combination of Categories I and II or Categories I~IV.
4 Requirements
Water-based metal cleaners and solvent-based metal cleaners shall meet those specified in Table 1 and Table 2 respectively.
Table 1 Index requirements for water-based metal cleaners
Item Index
Non-rustproof type Rustproof type
Category I Category II Category III Category IV Comprehensive
Appearance Liquid products Uniform, free of delamination and precipitation
Slurry products Uniform paste, free of agglomeration and obvious segregation
Powdery (or granular) products Uniform, free of agglomeration
3% (mass fraction) aqueous solution Free of delamination, precipitation and foreign matter
Moisture and volatile matter Liquid products/% ≤ 80
Slurry products/% ≤ 50
Powdery (or granular) products/% ≤ 30
pH [3% (mass fraction) aqueous solution, 25℃] ≥7.0 7.0~11.5
Cleaning power [3% (mass fraction) aqueous solution, 60℃]/% ≥ 80
Foam performance (50±2)℃/mm ≤ Instant height: 80; height after 5min: 20 (applicable to pressure spray-washing products)
Corrosivity [(80±2)℃, 2h] 45# steel Appearance/grade 0 0 — — — Corrosivity and rust resistance shall be tested by selecting corresponding metal test pieces according to the express categories of samples, and the limits shall meet the requirements of each individual category
Corrosion amount/mg ≤ 2 2 — — —
Z30 cast Iron Appearance/grade ≤ 1 — 1 — —
Corrosion amount/mg ≤ 2 — 2 — —
H62 brass Appearance/grade ≤ 1 — — 1 —
Corrosion amount/mg ≤ 3 — — 3 —
LY12 duralumin Appearance/grade 0 — — — 0
Corrosion amount/mg ≤ 2 — — — 2
Rust resistance [(35±2)℃, RH(90±2)%, 24h] 45# steel/grade Not required 0 — — —
Z30 cast iron/grade ≤ — 1 — —
H62 brass/grade ≤ — — 1 —
LY12 duralumin/grade — — — 0
Rinsing performance (stainless steel sheet) Free of visible cleaner residues
Stability at high temperature [(60+2)℃, 6h] Liquid products Uniform, free of delamination
Slurry products Uniform paste, free of separation
Stability at low temperature [(-5±2)℃, 24h] Liquid products Uniform, free of delamination, crystallization or precipitation
Slurry products Uniform paste, free of separation by crystallization and obvious segregation
Total content of phosphorus pentoxide/% ≤ 1.1 (applicable to phosphorus-free products)
Note: In the corrosion test, if the corrosion amount is negative (except for the negative value caused by system error, with a result of not greater than 0.3mg), it is judged that this item is not in conformity.
Table 2 Index requirements for solvent-based metal cleaners
Item Index
Appearance Uniform, free of delamination and precipitated liquid
Odor Slight solvent odor
Content of non-volatile matter (in 100g sample)/% ≤ 0.5
Acidity (calculated by HCl/100g)/% ≤ 1.0
Corrosivity 45# steel Corrosion amount/mg ≤ 1
Appearance/grade 0
Z30 cast Iron Corrosion amount/mg ≤ 1
Appearance/grade 0
LY12 duralumin Corrosion amount/mg ≤ 1
Appearance/grade 0
H62 brass Corrosion amount/mg ≤ 1
Appearance/grade 0
Moisture/% ≤ 0.3
Surface tension/(mN/m) ≤ 30
Volatility (tsample/tether) ≤ 3
5 Test methods
Unless otherwise stated, only recognized analytically pure reagents and Grade III water specified in GB/T 6682 are used for the analysis.
5.1 Metal test piece
5.1.1 Material and specification of test piece
The dimension of test piece is shown in Figure 1. Materials and specifications used in the test include:
a) 45# steel, 50mm×25mm×(3~6)mm;
b) Z30 Grade I cast iron, 50mm×25mm×(3~6)mm;
c) H62 brass, 50mm×25mm×(3~6)mm;
d) LY12-BC2 duralumin, 50mm×25mm×(3~6)mm;
e) 1Cr18Ni9Ti stainless steel, 50mm×25mm×(3~6)mm.
5.1.2 Polishing and cleaning of test piece
Spread 240# abrasive cloth on the flat plate, and polish the test piece in a direction parallel to the long side of the test piece. Wipe up the polished test piece with absorbent gauze or absorbent cotton, hang it on the S-shaped hook, immerse it in anhydrous ethanol, and then scrub it with absorbent gauze or absorbent cotton clamped by tweezers. Then, transfer the test piece into acetone or petroleum ether at 30~60℃ for rinsing, dry it with hot air, and hang the clean test piece with S-shaped hook on the test piece rack for later use.
Contents of GB/T 35759-2017
Foreword i
1 Scope
2 Normative references
3 Product classification
4 Requirements
5 Test methods
6 Inspection rules
7 Marking, packaging, transportation and storage
Annex A (Normative) Determination of acidity
