The common problems can be roughly divided into three types: uneven coating, anti-corrosion agent dripping, and anti-corrosion agent bubbling.

1. Uneven Coating. The root cause of this problem is the uneven distribution of the corrosion inhibitor on the surface of the steel pipe. Some parts are coated too thickly, while others are coated too thinly or not at all. This results in areas where the coating is applied too thickly exceeding the standard thickness, leading to waste; while areas where the coating is applied too thinly or not at all will have reduced corrosion resistance, causing rust to form.

2. Corrosion Insulator Dripping. When corrosion inhibitors solidify on the surface of a steel pipe like water droplets, it is called corrosion inhibitor dripping. This phenomenon often does not directly affect the corrosion resistance and can still ensure that the steel pipe has a certain required corrosion resistance. However, from an aesthetic point of view, steel pipes with corrosion inhibitor dripping look dull and uneven, directly affecting the appearance of the steel pipe.

3. Corrosion Insulator Blistering. Air trapped in the corrosion inhibitor causes air bubbles to form in the coating of the steel pipe. These bubbles vary in size depending on the specifications of the steel pipe. The larger bubbles are shaped like the air bubbles on the protective covers of some home appliance remote controls; they will burst if you press down on them with a little force. The foaming phenomenon of corrosion inhibitors not only affects the appearance of steel pipes, making the entire surface of the steel pipe appear rough and uneven, but the breakage of bubbles will also reduce the standard coating thickness, reduce the anti-corrosion ability, and lead to rust in the steel pipe area where the bubbles are located.

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