GB/T 35759-2017Metal cleaner (English PDF)

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°C] >=7.0 7.0~11.5

Cleaning power [3% (mass fraction) aqueous solution, 60°C]/% >= 80

Foam performance (50±2)°C/mm <= Instant height: 80; height after 5min: 20 (applicable to pressure spray-washing products)

Corrosivity [(80±2)°C, 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)°C, 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)°C, 6h] Liquid products Uniform, free of delamination

Slurry products Uniform paste, free of separation

Stability at low temperature [(-5±2)°C, 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.