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How to improve the anti-corrosion effect of highway guardrails
The old guard board is renovated Before the old fence is reuse, in order to ensure corrosion durability Sex and improve the landscape effect, the need for anti-corrosion renovation treatment. on the basis of The corrosion degree of different categories, considered from the economic point of view, different use Different anti-corrosion renovation treatment methods. Class I old guard board coating is intact, no corrosion, first prevention Corruption coating thickness test, when the anticorrosion coating thickness meets GB / T 182266], namely the average galvanizing of the hot dip galvanized coating Layer thickness not less than 84um, hot dip galvanized polyester composite coating flat All thickness of not less than 39um, minimum thickness of polyester coating Less than 76m, can not be anticorrosion renovation treatment. If the type of old guard plate is only corroded in the bolt hole, the other parts When the anticorrosive coating is not deteriorated, the local coating ring can be used The method of oxygen zinc paint only protects the corrosion of bolt holes. The steps of local epoxy zinc-rich paint are: grinding rust removal, Clean, air-dry, and apply epoxy zinc-rich paint. Old guardrail in other parts other than the bolt hole The plate shall be protected by GB / T18226] after rust removal The rot treatment method is the anti-corrosion renovation of the whole guard plate. After the old guard board is reshaped with special equipment, The whole guard plate shall be renovated against corrosion.
The degree of rust is divided into three categories. Class I, the coating is overall intact, and the coating is not Subgradation, guard plate is not rust; category, local coating deterioration, guard plate Local corrosion: the first category, a large area of coating deterioration, a large area of the fence board Rust, the section thickness is significantly thinner. (2) Mechanical properties of materials according to the corrosion degree of different categories Ability test, according to the test results: corrosion on tensile strength, yield Strength, elongation after breaking, non-proportional extension strength has obvious influence, corrosion process The more serious the degree, the smaller the value of these four mechanical properties indicators; the class guard plate A large amount of tensile strength and lower yield strength tests are less than the specification requirements, Not reusable: the mechanical properties of class I guards are generally met Specification requirements; although the mechanical properties of the plate and specifications Evaluation has a certain deviation, but the deviation value is not large, in the guardrail structure Under the premise of real vehicle crash test verification, it can be reused. (3) Give the old guard plate according to the corrosion degree of different categories Anti-corrosion treatment principle, generally divided into 3 categories: ① class I old guard board is not Anti-corrosion renovation; ② only old corrosion at the bolt hole The the plate apply apply epoxy zinc rich paint to the bolt hole Anti against corrosion; other than ③ bolt holes Rusting of the old guard board, rust removal cleaning after the whole guardrail Anti-corrosion renovation treatment of the plate.
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