The object of the work was to determine the effect of some added elements to 65/35 and 60/40 brass castings on their dezincification properties in NaCl solution.
It was demonstrated that the quantitative measurement of dezincification could be performed by the method of colorimetric determination using the photometer, and that tin was most effective as an addition alloy element to protect the dezincification, though manganese and aluminum were slightly effective, while iron was assessed as an undesirable constituent.
The 65/35 cast plain brass which was consisted of α-monophase was immunity for the dezincification phenomena showing the typical chemical corrosion.
Micrographic examination of corroded surface has shown that the β-phase was locally attacked at the first stage of corrosion in α/β or β/γ alloy systems, then the dissolved copper was redeposited on the copper rich cathode which was formed on β phase.

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Hydrolysis of wood with concentrated sulfuric acid has been studied in this country by the members of the Wood Saccharification Discussion Committee (Japan). This paper describes the results of the corrosion tests for some materials of construction for the hydrolizer in the experimental apparatus (Fig. 3)
The results obtained from the tests in the boiling liquid in the process (10%H₂SO₄, 8% glucose and 1% acetic acid aqueous solution; actual solution) were as follows:
Supiron Lead Brass }usable Copper Gun metal} unusable

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Corrosion tests for many kinds of the filter cloth's in the hot sugar solution were carried on for the pilot plant of wood saccharification process, and it was found that “Kureharon” (Vinylidene chloride polymer) cloths were excellent for this use.

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A painted dock gate (Approx. 2000ft²) was prevented from corrosion by means of installed thirteen zinc anodes of super high grade. The graph and table showing the current out-put and consumption rate of each anode, and a table exhibiting the protective result with steel test pieces are presented. It was found that the super high grade zinc anode shows steady current out-put and excellent current efficiency in sea-water.

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