First, the outer side of the metal culverts hole is mainly soil corrosion, the inner side of the metal culverts hole is mainly water corrosion and atmospheric corrosion, the corrosion prevention of the metal culverts hole is mainly soil corrosion and water corrosion protection.

Two, in the design stage of metal culverts hole material selection, should fully occupy all kinds of material information, data and corrosion characteristics in a specific medium, and make full use of effective work experience and work procedures.

Three, the corrosion design of metal culverts should follow the principle of prevention and protection combined, according to the corrosive medium produced in the production process, environmental conditions, production operation management level and construction and maintenance conditions, according to local conditions, different treatment, comprehensive selection of corrosion prevention measures.Protection should be strengthened for parts that endanger personal safety and are difficult to maintain, as well as important load-bearing structures and components.

Four, to fully understand the corrosion environmental conditions of metal culverts hole, including:
(1) chemical factors: the composition of the medium (including impurities), pH value, oxygen content, possible chemical reactions, etc.
(2) physical factors: temperature of the medium, flow rate, heating and cooling conditions, type and size of the force, etc.
Special attention should be paid to high temperature, low temperature, high pressure, vacuum, impact load, alternating stress and other environmental conditions.
(3) in the anti-corrosion structure design of metal culverts hole, but also consider whether the shape of the structure and components and the combination of each other meet the requirements of anti-corrosion, especially to prevent various types of local corrosion.

Five. The corrosion effect of metal culverts hole should be considered from many aspects such as material selection and structural design. Specifically, it can be started from the following two aspects:
(1) the correct choice of materials, anti-corrosion methods and the service life of the structure, and deal with its relationship with the engineering economy.
(2) consider the damage or anti-corrosion measures in the installation process, fully consider the fatigue limit of the joint action of stress and corrosion, fully consider the stress loss caused by the corrosion of the connecting part.