How to plot a time after conversion

I want to convert one column to time and then plot it. What I did is this:

df = pd.read_csv('vv.txt',sep=" ",names=list(["time", "size", "type"]))

df.time = df.time.apply(lambda X: "{0:02.0f}:{1:02.0f}".format(*divmod(float(X) * 60, 60)))

df["time"] = pd.to_datetime(df["time"], format='%H:%M' ).apply(pd.Timestamp)

df["time"] = df["time"].map(lambda x: x.strftime("%H:%M"))
plt.scatter(df['time'], df['size'])

and it shows this as a result, no X-axis is showing right. How can I solve this?

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