UDC : ' : '24' : '24'26' : : A Study of Condition of Pits Formation and Their Fe
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1 UDC : ' : '24' : '24'26' : : A Study of Condition of Pits Formation and Their Features in Chloride Solution Norio FUKASAKO, Hirokazu MURASE, and Kiyoshi KITA Synopsis: Anodic polarization and immersion tests in 3% NaCl solution and other chloride solutions at 35 Ž have been carried out using mild steels, alloy steels and aluminum alloy in order to investigate the relation between number of pits per unit area and pit diameter, shape of pit and the difference between the pit occurring by anodic polarization and that occurring by immersion. The results obtained are summarized as follows: (1) In the case of the immersion test, growth of pit is closely related to ph of the solution. Pits grow more easily in low ph solution than in high ph solution. (2) In the case of anodic polarization test, number of pits per unit area and their morphology depend greatly on the potential applied. The morphology of pits occurring in SUS316 by the anodic polarization test less than 0.3 VSCE is nearly same as that of naturally occured one. (3) It was observed that pits occured at triple points of grain boundary and at nonmetallic inclusions. (4) Grain boundaries, micro-pits and crystallographic morphology were observed at the bottom of pit in SUS316 after immersion in FeCl3 solution.
2 Table 1. Chemical compositions of materials used. Fig. 1. Schematic diagram of experimental apparatus.
3 b Enlarged figure ofpit B Fig. 2. Anodic polarization curves of various alloys and steels in 3% NaCl solution at the temperature of 35 Ž. C Enlarged figure of pit C Photo. 1. SEM observation of artificial pits occured in SUS316 after anodic polarization for 6 min at 0.3V vs SCE in 1.2 mol/l FeCl3 solution at 35 Ž. Photo. 2. Result of line anaiysis of the nonmetallic inclusion in the pit. 115
4 116鉄 と 鋼 第65年(1979)第1号 数 の小 さな 孔 食 が形 成 され,や や 特 異 な腐 食 形 態 となつ Photo. 3. SEM observation of artificial pits occured in SUS316 after anodic polarization for 40 min at 0.3V vs SCE. (a) microstructure of pita, pitb, pitc, (b) (d), enlarged figure of pitc, (c), enlarged figure of pitb. 径 が大 き くな るにつ れ て 孔食 密 度 は お お む ね 小 さ くな る が,こ の 場 合 は さほ ど不連 続 性 が 認 め られ な い.0.1V の電 位 で あ らわれ た大 きな 孔 食 の底 部 を 走 査 型電 子 顕 微 鏡 で観 察 す る と前項 で 説 明 したFeCl3水 孔 食-C(Photo.3(b))と 溶 液 中 で生 じた 類 似 して い た.0.48Vと1.0V Fig. 3. Relations between pit density and pit diameter at various voltages in 3% NaCl solution. の印 加 電 位 で は,丸 型 の 孔食 を 中心 として 同 心 円状 に 多 Table 2. Formation (tested of materials pits in are various shown chloride in Table 116 solutions 1) at the temperature of 35 Ž.
5 SUS 316 SUS 304 SUS 316 SUS 304 Photo. 4. SEM observation of pits occured in SUS 316 and SUS 304 after 48h immersion test in 1.2 mol/l FeCl3, solution. (a) (b) pit of SUS 316, (c) crack occured on the cover to a pit of SUS 304 and (d) pit of SUS 304 after removal of the cover.
6
7 1) M. A. STREICHER: J. Electrochem. Soc., 103 (1956), p.375 2) N. D. GREENE and M. G. FONTANA: Corrosion, 15 (1959), p.255 3) H. H. UHLIG and J. R. GILMAN: Corrosion, 20 (1964), p.289 4) R. F. STEIGERWALD: Corrosion, 22 (1966), p ) T. P. HOAR: Discussions Faraday Soc., (1947), No. 1 p.299 6) A. HICKLING: Tr. Faraday Soc., 41 (1945), p.333
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