Preparation method of intercrystalline corrosion sample for coating metal of?metallurgy composite tube

Abstract

The invention discloses a preparation method of an intercrystalline corrosion sample for coated metal of a metallurgy composite tube, comprising the following steps: (1) cutting down the coating metal from a fusion zone of the metallurgy composite tube to form a sample; (2) pasting a piece of paper on a test surface of the sample, and then preheating the sample; (3) spraying epoxy resin powder on non-test surfaces and edges of the sample to cover the non-test surfaces of the sample; and (4) putting the sample with the epoxy resin powder into a small resistance furnace for heating, and taking out the sample till the epoxy resin powder forms a layer of compactly cured protective film on the non-test surfaces of the sample, and then uncovering the paper on the test surface and finishing the preparation of the sample. The preparation method of the invention has the following beneficial effect: the result of an acid corrosion test of the sample is more accurate and reliable by spraying a layer of protective film on the contact surfaces and edges of the fusion zone of the sample of the coating metal of the metallurgy composite tube.

Description

technical field [0001] The invention relates to a method for preparing a metal intergranular corrosion sample of a metallurgical composite pipe coating, and belongs to the technical field of preparation of a metal intergranular corrosion sample of a composite pipe coating. Background technique [0002] The preparation of single-metal austenite and duplex stainless steel tube intergranular corrosion samples is relatively simple, directly processed and tested according to the sample size specified in the national standard, without any cladding, but for stainless steel or nickel-based alloy crystals in composite tubes The preparation of intergranular corrosion samples is relatively complicated. At present, there is no literature on the preparation of intergranular corrosion samples of composite pipe cladding metals. Some manufacturers' laboratories directly process the base metal and conduct tests according to the single metal test method. These test results are not credible. ...

AI Technical Summary

Problems solved by technology

[0002] The preparation of single-metal austenite and duplex stainless steel tube intergranular corrosion samples is relatively simple, directly processed and tested according to the sample size specified in the national standard, without any cladding, but for stainless steel or nickel-based alloy crystals in composite tubes However, the preparation of intergranular corrosion samples is relatively complicated. At present, there is no reference in any literature on the preparation of intergranular corrosion samples of composite pipe cladding metals.

Some manufacturers' laboratories directly process the base metal and conduct tests according to the single metal test method. These test results are not credible.