Ammonia is very soluble in water, forming a weak alkaline solution.

氨非常易溶于在水，生成弱碱性溶液。

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Nevertheless, in higher temperature or solution concentration of the alkaline solutions, the formation of stable passive layer is very difficulty.

而在高温或高浓度的碱性溶液中薄膜表面难以形成稳定的钝化保护层。

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