ChinaAutoRegs｜GB/T 6461-2002 英文版翻译/金属基体上金属和其它无机覆盖层 经腐蚀试验后的试样和试件的评级
Methods for Corrosion Testing of Metallic and Other Inorganic Coatings on Metallic Substrates – Rating of Test Specimens and Manufactured Articles Subjected to Corrosion Tests

1 SCOPE

This Standard specifies a method of evaluating the condition of decorative and protective metallic and inorganic coated test panels or articles which have been exposed to corrosive environments for test or for other purposes.
The method specified in this standard is applicable to test panels or articles exposed to natural atmospheres, in mobile or static conditions, and subjected to accelerated tests.
Note 1: Examples are given in the Bibliography of this standard.
This Standard recognizes that the protection rating can be assessed objectively in accordance with Clause 6. However, the assessment of appearance depends on many subjective factors (see 6.2).
Note 2: The edges of test panels or articles may be protected, e.g. by tape or wax, if this is an agreed part of the test and is recorded in the test report. This is essential if the specimens are cut from larger pieces and have exposed uncoated edges.

2 TERMS AND DEFINITIONS

For the purpose of this document, the following terms and definitions apply.

2.1
protection rating
Rp
protection rating number (see Table 1) assigned to the ability of the coating to protect the base metal from corrosion
2.2
protection defect
defect used to assess the protection rating, including crater corrosion, pin-hole corrosion, corrosion stain due to corrosion from the substrate, blisters and other defects that involve base metal corrosion
Note: Blisters on electroplated aluminum and zinc alloy die castings usually signify base metal corrosion, but the inspector’s judgment may be required to decide whether a blister does or does not arise at the substrate–coating interface.
2.3
appearance rating
RA
rating number (see Table 1) and symbols (see Table 2) assigned to describe the overall appearance of the specimen, including all defects caused by exposure
2.4
appearance defect
defect that detracts from the appearance of the specimen (see Table 2)
2.5
performance rating
combination of the protection rating number (Rp) followed by a slash mark followed by the appearance rating number (RA), i.e. Rp/RA
2.6
coating system
particular series of deposits including the thickness and type of layers in multilayer deposits and treatments which have been applied to the base metal
2.7
significant surface
part of the surface which is essential in the appearance or serviceability of the article and which is to be covered or is covered by the coating (see Clause 5)

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