Rapid Identification of Liquid Accelerant in Fire Scene Environment

doi:10.11902/1005.4537.2016.154

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (1): 74-80 DOI: 10.11902/1005.4537.2016.154

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Rapid Identification of Liquid Accelerant in Fire Scene Environment

Dongbai XIE¹(

),Guo SHAN²

1 Key Laboratory of Impression Evidence Examination and Identification Technology, National Police University of China, Shenyang 110854, China
2 Department of Forensic Science, Xinjiang Police College, Urumqi 830011, China

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Abstract

Oxidation tests of Cu and Q235 steel were conducted in air alone and a combustion atmosphere of kerosene-air mixture at 600, 700 and 800 ℃ respectively, the later aims to simulate the fire scene environment with the presence of fuel accelerant. Cracking and spallation of the formed oxide scales were observed by using optical microscopy. The results revealed that the existence of kerosene accelerated the oxidation of Cu and Q235, and changed the surface morphologies of the oxide scales. With the increasing temperature and time, serious spallation of the oxide scales was observed. Especially, due to the spallation of the oxide scale formed on Cu, the mass loss of Cu did occurr. Based on the features of the oxide scales formed on Cu and Q235, it is expected to offer complementary insight on determining the fire characteristics, such as exposure temperature, time period and whether liquid accelerant is involved.

Key words: fire scene accelerant identification metallic material high temperature oxidation

Received: 10 September 2016

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	Dongbai XIE
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Cite this article:

Dongbai XIE,Guo SHAN. Rapid Identification of Liquid Accelerant in Fire Scene Environment. Journal of Chinese Society for Corrosion and protection, 2017, 37(1): 74-80.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.154 OR https://www.jcscp.org/EN/Y2017/V37/I1/74

Fig.1 Tube furnace setup for oxidation experiment in air and simulated kerosene combustion environments

Table 1 Chemical compositions of Q235 steel and Cu(mass fraction / %)

Fig.2 Surface morphologies of pure Cu after oxidation at 600 ℃ in air (a, c) and combustion (b, d)environments for 30 min (a, b) and 60 min (c, d)

Fig.3 Surface morphologies of pure Cu after oxidation at 700 ℃ in air (a, c) and combustion (b, d)environment for 30 min (a, b) and 60 min (c, d)

Fig.4 Surface morphologies of pure Cu after oxidation in air (a) and combustion (b) environment for 60 min at 800 ℃

Fig.5 Surface morphologies of Q235 steel after oxidation at 600 ℃ in air (a, c) and combustion (b, d) environments for 30 min (a, b) and 60 min (c, d)

Fig.6 Surface morphologies of Q235 steel after oxidation at 700 ℃ in air (a, c) and combustion (b, d) environments for 30 min (a, b) and 60 min (c, d)

Fig.7 Surface morphologies of Q235 steel after oxidation at 800 ℃ in air (a, c) and combustion (b, d) environments for 30 min (a, b) and 60 min (c, d)

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