Corrosion Behavior of Extra Deep Drawing Cold Rolled Sheet in Stimulative Ocean-atmosphere Environment

doi:10.11902/1005.4537.2016.202

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 101-109 DOI: 10.11902/1005.4537.2016.202

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Corrosion Behavior of Extra Deep Drawing Cold Rolled Sheet in Stimulative Ocean-atmosphere Environment

Chengliang MAO¹,Kui XIAO^1,²(

),Chaofang DONG^1,²,Junsheng WU^1,²,Lidan YAN¹,Li JIANG¹

1 Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2 Key Laboratory for Corrosion and Protection (MOE), University of Science and Technology Beijing, Beijing 100083, China

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Abstract

The conversion period for the corrosion data of steels acquired respectively by the outerdoor exposure test and the indoor neutral salt spray test, which aims to simulate the corrosivity of the marine atmospheric environment at Wanning, was calculated by means of the equivalent conversion method, while taking the real marine atmospheric environmental data over the past three years at Wanning area into account. Then the corrosion behavior of an extra deep drawing cold rolled sheet DC06 and a carbon steel Q235 was comparatively studied through neutral salt spray test for desired conversion periods. In the meanwhile, the correlation between the results of the indoor neutral salt spray accelerated test and the outdoor air exposure test at Wanning is quantitatively studied by the grey correlation degree method. The results show that the corrosion kinetics curves of DC06 and Q235 by neutral salt spray test are in accordance with the power function law. For DC06 and Q235, their relevant results of neutral salt spray test for the conversion period (528 ha^-1) and the common period (480 ha^-1) respectively showed gray correlation degrees greater than 0.6 with those of the outdoor atmospheric exposure test at Wanning,indicating that the corrosion dynamics results measured indoor and outdoor respectively are of consistency. It is noted that the grey correlation degrees for the outdoor test results with those of indoor test for the conver sion period are higher than those for the common period.

Key words: extra deep drawing cold rolled sheet DC06 equivalent conversion accelerated test rey relational degree

Received: 14 October 2016

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	Chengliang MAO
	Kui XIAO
	Chaofang DONG
	Junsheng WU
	Lidan YAN
	Li JIANG

Cite this article:

Chengliang MAO,Kui XIAO,Chaofang DONG,Junsheng WU,Lidan YAN,Li JIANG. Corrosion Behavior of Extra Deep Drawing Cold Rolled Sheet in Stimulative Ocean-atmosphere Environment. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 101-109.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.202 OR https://www.jcscp.org/EN/Y2017/V37/I2/101

Table 1 Reduction factor of moist air and standard moist air

Table 2 Reduction factor of different concentration(mass fraction) of NaCl in water medium

Table 3 Accumulation of precipitation, fog, temperature and humidity in Wanning station

Table 4 Chemical compositions of Q235 and DC06 steels (mass fraction / %)

Fig.1 Corrosion mass loss curves of Q235 (a) and DC06 (b) steels in different periods after neutral salt spraytest (528 ha^-1)

Table 5 Relevant parameters of fitting curves

Fig.2 SEM images of Q235 steel after salt spray test for 11 d (a), 22 d (b), 33 d (c) and 44 d (d)

Fig.3 SEM images of DC06 steel after salt spray test for 11 d (a), 22 d (b), 33 d (c) and 44 d (d)

Fig.4 XRD spectra of corrosion products of Q235 (a) and DC06 (b) steels after salt spray test in different periods

Fig.5 Polarization curves of Q235 (a) and DC06 (b) steels after salt spray test in different periods

Table 6 Statistic of corrosion mass loss of Q235 and DC06 steels in accelerated and exposure test (528 ha^-1)

Table 7 Statistic of corrosion mass loss of Q235 and DC06 steels in accelerated and exposure test (480 ha^-1)

Table 8 Statistic of pretreatment loss data of Q235 and DC06 steels in accelerated and exposure test (528 ha^-1)

Table 9 Statistic of pretreatment loss data of Q235 and DC06 steels in accelerated and exposure test (480 ha^-1)

Table 10 Absolute difference of loss date of Q235 and DC06 steels in accelerated and exposure test (528 ha^-1)

Table 11 Absolute difference of loss date of Q235 and DC06 steels in accelerated and exposure test (480 ha^-1)

Tabl 12 Grey correlation of atmospheric exposure testsand accelerated tests

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